Add support for Reply-To field in mail_to helper
- Removed unused parameter to cookie serialize method and fixed usage of the same elsewhere
Merge pull request #18180 from vipulnsward/remove-unnecessary-name-passing

Removed unused parameter to cookie serialize method
Merge pull request #18107 from mkdynamic/add-reply-to-mail-to

Add support for Reply-To field in mail_to helper
Fix bug in ActionMailer guide.

When setting a mailer's default from address, you have to pass a hash
with a `:from` key; you can't pass just an email address.
Merge pull request #18183 from danbernier/master

Fix bug in ActionMailer guide.
List the Active Support Instrumentation guide in the index (as WIP)
Fix a few typos [ci skip]
Update grammar [ci skip]
Merge pull request #18190 from ef718/master

Fix grammar in Caching with Rails docs
Correct grammar to fix #18182 [ci skip]
Merge pull request #18185 from ivalkeen/add_missing_guides

List the Active Support Instrumentation guide in the index (as WIP)