Merge pull request #10924 from pjg/patch-1

Grammar fix [ci skip]

actionpack/lib/action_dispatch/middleware/cookies.rb

@@ -77,7 +77,7 @@ def cookie_jar
   #                       domain and subdomains.
   #
   # * <tt>:expires</tt> - The time at which this cookie expires, as a \Time object.
-  # * <tt>:secure</tt> - Whether this cookie is a only transmitted to HTTPS servers.
+  # * <tt>:secure</tt> - Whether this cookie is only transmitted to HTTPS servers.
   #   Default is +false+.
   # * <tt>:httponly</tt> - Whether this cookie is accessible via scripting or
   #   only HTTP. Defaults to +false+.