Removed references to code ownership page

Because no one actually uses that page

CONTRIBUTING.rst

@@ -140,12 +140,9 @@ Step 5: Code Review by Core Committer(s)
 If your pull request meets the requirements listed in the
 `contributor documentation`_, and it hasn't been rejected by a product owner,
 then it will be scheduled for code review by one or more core committers. This
-process sometimes takes awhile: currently, all core committers on the project
+process sometimes takes awhile: most of the core committers on the project
 are employees of edX, and they have to balance their time between code review
-and new development. Please also read our `code ownership page`_, which
-lists areas and concepts in the codebase that are "owned" by certain developers.
-If your change touches one of these areas or concepts, that developer should be
-one of the reviewers.
+and new development.
 
 Once the code review process has started, please be responsive to comments on
 the pull request, so we can keep the review process moving forward.
@@ -153,8 +150,6 @@ If you are unable to respond for a few days, that's fine, but
 please add a comment informing us of that -- otherwise, it looks like you're
 abandoning your work!
 
-.. _code ownership page: https://github.com/edx/edx-platform/wiki/Code-Ownership
-
 Step 6: Merge!
 ==============