Markdown style fixes for:

docs/clang_tool_refactoring.md

-# Caveats
-  * The current workflow requires git.
-  * This doesn't work on Windows... yet. I'm hoping to have a proof-of-concept working on Windows as well ~~in a month~~ several centuries from now.
+# Clang Tool Refactoring
 
-# Prerequisites
-Everything needed should be in a default Chromium checkout using gclient. third\_party/llvm-build/Release+Asserts/bin should be in your `$PATH`.
+[TOC]
 
-# Writing the Tool
-An example clang tool is being implemented in https://codereview.chromium.org/12746010/. Other useful resources might be the [basic tutorial for Clang's AST matchers](http://clang.llvm.org/docs/LibASTMatchersTutorial.html) or the [AST matcher reference](http://clang.llvm.org/docs/LibASTMatchersReference.html).
+## Caveats
 
-Build your tool by running the following command (requires cmake version 2.8.10 or later):
-```
-tools/clang/scripts/update.sh --force-local-build --without-android --with-chrome-tools <tools>
-```
-`<tools>` is a semicolon delimited list of subdirectories in `tools/clang` to build. The resulting binary will end up in `third_party/llvm-build/Release+Asserts/bin`. For example, to build the Chrome plugin and the empty\_string tool, run the following:
-```
-tools/clang/scripts/update.sh --force-local-build --without-android --with-chrome-tools "plugins;empty_string"
+*   The current workflow requires git.
+*   This doesn't work on Windows... yet. I'm hoping to have a proof-of-concept
+    working on Windows as well ~~in a month~~ several centuries from now.
+
+## Prerequisites
+
+Everything needed should be in a default Chromium checkout using gclient.
+`third_party/llvm-build/Release+Asserts/bin` should be in your `$PATH`.
+
+## Writing the Tool
+
+An example clang tool is being implemented in
+https://codereview.chromium.org/12746010/. Other useful resources might be the
+[basic tutorial for Clang's AST matchers](http://clang.llvm.org/docs/LibASTMatchersTutorial.html)
+or the
+[AST matcher reference](http://clang.llvm.org/docs/LibASTMatchersReference.html).
+
+Build your tool by running the following command (requires cmake version 2.8.10
+or later):
+
+```shell
+tools/clang/scripts/update.sh --force-local-build --without-android \
+--with-chrome-tools <tools>
 ```
 
-When writing AST matchers, the following can be helpful to see what clang thinks the AST is:
+`<tools>` is a semicolon delimited list of subdirectories in `tools/clang` to
+build. The resulting binary will end up in
+`third_party/llvm-build/Release+Asserts/bin`. For example, to build the Chrome
+plugin and the empty\_string tool, run the following:
+
+```shell
+tools/clang/scripts/update.sh --force-local-build --without-android \
+--with-chrome-tools "plugins;empty_string"
 ```
+
+When writing AST matchers, the following can be helpful to see what clang thinks
+the AST is:
+
+```shell
 clang++ -cc1 -ast-dump foo.cc
 ```
 
-# Running the tool
-First, you'll need to generate the compilation database with the following command:
-```
+## Running the tool
+
+First, you'll need to generate the compilation database with the following
+command:
+
+```shell
 cd $HOME/src/chrome/src
-ninja -C out/Debug -t compdb cc cxx objc objcxx > out/Debug/compile_commands.json
+ninja -C out/Debug -t compdb cc cxx objc objcxx > \
+out/Debug/compile_commands.json
 ```
 
-This will dump the command lines used to build the C/C++ modules in all of Chromium into the resulting file. Then run the following command to run your tool across all Chromium code:
-```
-# Make sure all chromium targets are built to avoid missing generated dependencies
+This will dump the command lines used to build the C/C++ modules in all of
+Chromium into the resulting file. Then run the following command to run your
+tool across all Chromium code:
+
+```shell
+# Make sure all chromium targets are built to avoid missing generated
+# dependencies
 ninja -C out/Debug
-tools/clang/scripts/run_tool.py <toolname> <path/to/directory/with/compile_commands.json> <path 1> <path 2> ...
+tools/clang/scripts/run_tool.py <toolname> \
+<path/to/directory/with/compile_commands.json> <path 1> <path 2> ...
 ```
 
-`<path 1>`, `<path 2>`, etc are optional arguments you use to filter the files that will be rewritten. For example, if you only want to run the `empty-string` tool on files in `chrome/browser/extensions` and `sync`, you'd do something like:
-```
-tools/clang/scripts/run_tool.py empty_string out/Debug chrome/browser/extensions sync
+`<path 1>`, `<path 2>`, etc are optional arguments you use to filter the files
+that will be rewritten. For example, if you only want to run the `empty-string`
+tool on files in `chrome/browser/extensions` and `sync`, you'd do something like:
+
+```shell
+tools/clang/scripts/run_tool.py empty_string out/Debug \
+chrome/browser/extensions sync
 ```
 
-# Limitations
-Since the compile database is generated by ninja, that means that files that aren't compiled on that platform won't be processed. That means if you want to apply a change across all Chromium platforms, you'll have to run the tool once on each platform.
+## Limitations
 
-# Testing
+Since the compile database is generated by ninja, that means that files that
+aren't compiled on that platform won't be processed. That means if you want to
+apply a change across all Chromium platforms, you'll have to run the tool once
+on each platform.
+
+## Testing
+
 `test_tool.py` is the test harness for running tests. To use it, simply run:
-```
+
+```shell
 test_tool.py <tool name>
 ```
-Note that name of the built tool and the subdirectory it lives in at `tools/clang` must match. What the test harness does is find all files that match the pattern `*-original.cc` in your tool's tests subdirectory. It then runs the tool across those files and compares it to the expected result, stored in `*-expected.cc`
+
+Note that name of the built tool and the subdirectory it lives in at
+`tools/clang` must match. What the test harness does is find all files that
+match the pattern `*-original.cc` in your tool's tests subdirectory. It then
+runs the tool across those files and compares it to the expected result, stored
+in `*-expected.cc`