Fix some typos in gn's documentation for "copy".

tools/gn/docs/reference.md

 # GN Reference
 
 *This page is automatically generated from* `gn help --markdown all`.
 
 ## **\--args**: Specifies build arguments overrides.
 
 ```
   See "gn help buildargs" for an overview of how build arguments work.
 
   Most operations take a build directory. The build arguments are taken
@@ skipping 1027 matching lines @@
 ## **copy**: Declare a target that copies files.
 
 ### **File name handling**
 
 ```
   All output files must be inside the output directory of the build.
   You would generally use |$target_out_dir| or |$target_gen_dir| to
   reference the output or generated intermediate file directories,
   respectively.
 
-  Both "sources" and "outputs" must be specified. Sources can
+  Both "sources" and "outputs" must be specified. Sources can include
   as many files as you want, but there can only be one item in the
   outputs list (plural is used for the name for consistency with
   other target types).
 
   If there is more than one source file, your output name should specify
-  a mapping from each source files to output file names using source
+  a mapping from each source file to an output file name using source
   expansion (see "gn help source_expansion"). The placeholders will
-  will look like "{{source_name_part}}", for example.
+  look like "{{source_name_part}}", for example.
 
 ```
 
 ### **Examples**
 
 ```
   # Write a rule that copies a checked-in DLL to the output directory.
   copy("mydll") {
     sources = [ "mydll.dll" ]
     outputs = [ "$target_out_dir/mydll.dll" ]
@@ skipping 2444 matching lines @@
   See "gn help runtime_deps" for how these are used.
 
 
 ```
 ## **data_deps**: Non-linked dependencies.
 
 ```
   A list of target labels.
 
   Specifies dependencies of a target that are not actually linked into
-  the current target. Such dependencies will be built and will be available
-  at runtime.
+  the current target. Such dependencies will be built and will be
+  available at runtime.
 
   This is normally used for things like plugins or helper programs that
   a target needs at runtime.
 
   See also "gn help deps" and "gn help data".
 
 ```
 
 ### **Example**:
 ```
@@ skipping 238 matching lines @@
 
   These flags are passed on the command-line to the linker and generally
   specify various linking options. Most targets will not need these and
   will use "libs" and "lib_dirs" instead.
 
   ldflags are NOT pushed to dependents, so applying ldflags to source
   sets or static libraries will be a no-op. If you want to apply ldflags
   to dependent targets, put them in a config and set it in the
   all_dependent_configs or public_configs.
 
+```
+
+### **Ordering of flags and values**:

[eroman, 2015/09/15 17:57:26]

Not sure why this change was added.

I generated the file using
  gn help --markdown all > tools/gn/docs/reference.md

So I presume it is correct.

+
+```
+  1. Those set on the current target (not in a config).
+  2. Those set on the "configs" on the target in order that the
+     configs appear in the list.
+  3. Those set on the "all_dependent_configs" on the target in order
+     that the configs appear in the list.
+  4. Those set on the "public_configs" on the target in order that
+     those configs appear in the list.
+  5. all_dependent_configs pulled from dependencies, in the order of
+     the "deps" list. This is done recursively. If a config appears
+     more than once, only the first occurance will be used.
+  6. public_configs pulled from dependencies, in the order of the
+     "deps" list. If a dependency is public, they will be applied
+     recursively.
+
 
 ```
 ## **lib_dirs**: Additional library directories.
 
 ```
   A list of directories.
 
   Specifies additional directories passed to the linker for searching
   for the required libraries. If an item is not an absolute path, it
   will be treated as being relative to the current build file.
@@ skipping 1033 matching lines @@
 **  \--nocolor**: Force non-colored output.
 **  -q**: Quiet mode. Don't print output on success.
 **  \--root**: Explicitly specify source root.
 **  \--runtime-deps-list-file**: Save runtime dependencies for targets in file.
 **  \--time**: Outputs a summary of how long everything took.
 **  \--tracelog**: Writes a Chrome-compatible trace log to the given file.
 **  -v**: Verbose logging.
 **  \--version**: Prints the GN version number and exits.
 
 ```