Update and fix some markdown docs

docs/native_client_in_google_chrome.md

 Native Client is now built into the Dev channel of Google Chrome. This page
 tells you how to enable and use the integrated version of Native Client.
 
 **Note:** For now, the integrated version of Native Client has less
 functionality than the plug-in. If you want to see everything that Native Client
 can do, [download the tarball](downloads.md) and install the plug-in. For
 details of what's different about the integrated version, see [Known issues]
 (NativeClientInGoogleChrome#Known_issues.md).
 
-**Contents:**
-
 # How to enable Native Client in Google Chrome
 
-1.  [Download Google Chrome](http://www.google.com/chrome), if you don't already
-    have it.
-2.  Subscribe to the [Dev channel]
-    (http://dev.chromium.org/getting-involved/dev-channel).
-3.  Launch Google Chrome from the command line, adding **--enable-nacl**. On Mac
-    and Linux, if you're using dev channel release 5.0.375.9 or 5.0.371.0,
-    respectively (or an earlier version), also add **--no-sandbox**. On Windows,
-    your command should look like this:
+1. [Download Google Chrome](http://www.google.com/chrome), if you don't already
+   have it.
+2. Subscribe to the [Dev channel](http://dev.chromium.org/getting-involved/dev-channel).
+3. Launch Google Chrome from the command line, adding **--enable-nacl**. On Mac
+   and Linux, if you're using dev channel release 5.0.375.9 or 5.0.371.0,
+   respectively (or an earlier version), also add **--no-sandbox**. On Windows,
+   your command should look like this:
 
-<blockquote><b><pre><code>chrome.exe --enable-nacl</code></pre></b></blockquote>
+        chrome.exe --enable-nacl
 
 **Warning:** We recommend running Google Chrome with the --no-sandbox or
 --enable-nacl flag **only** for testing Native Client and **not for regular web
 browsing**.
 
 # How to find and run examples and tests
 
 1.  In any browser, bring up the [Getting Started]
     (http://nativeclient.googlecode.com/svn/trunk/src/native_client/documentation/getting_started.html)
     document. You'll follow some—but not all—of its instructions. Specifically:
     1.  [Get the software]
         (http://nativeclient.googlecode.com/svn/trunk/src/native_client/documentation/getting_started.html#software).
         (Download the tarball, extract the files, and make sure you have the
         right version of Python.)
     2.  [Start a local HTTP server]
         (http://nativeclient.googlecode.com/svn/trunk/src/native_client/documentation/getting_started.html#httpd),
-        if one isn't already running on your computer. <br /><br />
+        if one isn't already running on your computer.
 2.  In Google Chrome, view the Browser Test Page, using **localhost** for the
-    hostname. For example: <br /> <br /><a
-    href='http://localhost:5103/scons-out/nacl-x86-32/staging/examples.html'><a
-    href='http://localhost:5103/scons-out/nacl-x86-32/staging/examples.html'>http://localhost:5103/scons-out/nacl-x86-32/staging/examples.html</a></a><br
-    /><br />
+    hostname. For example: [http://localhost:5103/scons-out/nacl-x86-32/staging/examples.html](http://localhost:5103/scons-out/nacl-x86-32/staging/examples.html)
 3.  Click links to examples and tests to run them.
 
 When Google Chrome is launched with the **--enable-nacl** flag, the integrated
 version of Native Client is used to run the examples and tests. Otherwise, the
 Native Client plug-in (if installed) is used to run them.
 
 The following tests should work in the integrated version of Native Client:
 
-*   Tests that have no audio or graphics<br /> The results of these tests should
-    be the same as if you executed them in Google Chrome using the Native Client
-    plug-in.
+* Tests that have no audio or graphics:
+  The results of these tests should be the same as if you executed them in
+  Google Chrome using the Native Client plug-in.
 
-*   Mandelbrot performance test<br /> This works because all drawing is from
-    JavaScript; Native Client is used only for calculations.
+* Mandelbrot performance test:
+  This works because all drawing is from JavaScript; Native Client is used only
+  for calculations.
 
 The following examples don't currently work:
 
-*   Examples with graphics (except for the Mandelbrot performance test) <br
-    />This includes everything in the Examples column except the SRPC hello
-    world example.
+* Examples with graphics (except for the Mandelbrot performance test):
+  This includes everything in the Examples column except the SRPC hello
+  world example.
 
 For details about what each example and test contains, see the [Examples and
-Tests]
-(http://nativeclient.googlecode.com/svn/trunk/src/native_client/documentation/examples.html)
+Tests](http://nativeclient.googlecode.com/svn/trunk/src/native_client/documentation/examples.html)
 page and the README files in the source code.
 
 # Known issues
 
-*   Graphics and audio from native code don't work unless you're using the
-    proposed NPAPI improvements ([announcement]
-    (http://groups.google.com/group/native-client-announce/browse_thread/thread/3607403cbc165499),
-    [spec](https://wiki.mozilla.org/Plugins:PlatformIndependentNPAPI)). These
-    new 2D and 3D APIs provide access to video and audio.
-*   In some Dev-channel builds of Google Chrome, enabling Native Client requires
-    disabling the Google Chrome sandbox.
+* Graphics and audio from native code don't work unless you're using the
+  proposed NPAPI improvements ([announcement]
+  (http://groups.google.com/group/native-client-announce/browse_thread/thread/3607403cbc165499),
+  [spec](https://wiki.mozilla.org/Plugins:PlatformIndependentNPAPI)). These
+  new 2D and 3D APIs provide access to video and audio.
+* In some Dev-channel builds of Google Chrome, enabling Native Client requires
+  disabling the Google Chrome sandbox.
 
 # More information
 
 For information about the design and implementation of Google Chrome, see the
 [Chromium project website](http://dev.chromium.org).