Fix typo in caching docs.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4740 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/caching.rb

@@ -158,7 +158,7 @@ def caching_allowed
     # "jamis.somewhere.com/lists/" -- which is a helpful way of assisting the subdomain-as-account-key pattern.
     #
     # Different representations of the same resource, e.g. <tt>http://david.somewhere.com/lists</tt> and <tt>http://david.somewhere.com/lists.xml</tt>
-    # are treated like separate requests and so are cached separately. Keep in mine when expiring an action cache that <tt>:action => 'lists'</tt> is not the same
+    # are treated like separate requests and so are cached separately. Keep in mind when expiring an action cache that <tt>:action => 'lists'</tt> is not the same
     # as <tt>:action => 'list', :format => :xml</tt>.
     module Actions
       def self.included(base) #:nodoc: