Use genderless pronouns in API docs

actionpack/lib/action_controller/base.rb

@@ -99,7 +99,7 @@ module ActionController
   # or you can remove the entire session with +reset_session+.
   #
   # Sessions are stored by default in a browser cookie that's cryptographically signed, but unencrypted.
-  # This prevents the user from tampering with the session but also allows him to see its contents.
+  # This prevents the user from tampering with the session but also allows them to see its contents.
   #
   # Do not put secret information in cookie-based sessions!
   #

activerecord/lib/active_record/validations/uniqueness.rb

@@ -204,7 +204,7 @@ module ClassMethods
       # exception. You can either choose to let this error propagate (which
       # will result in the default Rails exception page being shown), or you
       # can catch it and restart the transaction (e.g. by telling the user
-      # that the title already exists, and asking him to re-enter the title).
+      # that the title already exists, and asking them to re-enter the title).
       # This technique is also known as
       # {optimistic concurrency control}[http://en.wikipedia.org/wiki/Optimistic_concurrency_control].
       #