make sure both headers are set before checking for ip spoofing
"generates" applies to "collection radio" so it should be singular
take out reference to previous versions of Rails
Revert ""generates" applies to "collection radio" so it should be singular"

This reverts commit faeb33dc036e4f707491c91a23ee3e990573141b.

Reason: Code changes can't be done on docrails
Updated with latest method [ci skip]
Updated the file path [ci skip]
Updated guides with latest method [ci skip]
Removed doc of diff method [ci skip]
asset_url => asset-url in sass-rails docs [ci skip]
EncryptedCookieStore => CookieStore [ci skip]
surplus : in attachment_fu plugin

surplus ':' character in url
incorrect urls 

I've found two incorrects urls for adding ':' at the end of the url
incorrect url

incorrect url
Fix Show link on resource
`skiping` => `skipping`
use active voice and use more descriptive terms
Fix link_to return value
The documentation is showing the link_to method as just returning
the contents of the url_for method. It should be returning an
"<a>" tag with the correct href set.
Added missing active record configurations.
Strong parameters should permit nested number as key. Closes #12293
Fixed issue #12327