[symfony#2337] Minor tweaks to new contribute git doc

Author: weaverryan

contributing/code/git.rst

@@ -8,7 +8,7 @@ Pull Requests
 -------------
 
 Whenever a pull request is merged, all the information contained in the pull
-request (including comments) are saved in the repository.
+request (including comments) is saved in the repository.
 
 You can easily spot pull request merges as the commit message always follows
 this pattern:
@@ -19,7 +19,7 @@ this pattern:
 
 The PR reference allows you to have a look at the original pull request on
 Github: https://github.com/symfony/symfony/pull/1111. But all the information
-you can get on Github are also available from the repository itself.
+you can get on Github is also available from the repository itself.
 
 The merge commit message contains the original message from the author of the
 changes. Often, this can help understand what the changes were about and the

contributing/map.rst.inc

@@ -6,6 +6,7 @@
   * :doc:`Tests </contributing/code/tests>`
   * :doc:`Coding Standards</contributing/code/standards>`
   * :doc:`Code Conventions</contributing/code/conventions>`
+  * :doc:`Git</contributing/code/git>`  
   * :doc:`License </contributing/code/license>`
 
 * **Documentation**