minor #13332 Fx: Typo (OskarStark)

This PR was merged into the 4.4 branch.

Discussion
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Fx: Typo

IMO it looks better afterwards.

Current:
<img width="371" alt="Screenshot 2020-03-12 11 45 09" src="https://user-images.githubusercontent.com/995707/76513750-09f1df00-6457-11ea-86c4-19b71d561928.png">

Commits
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d76e3e0 Fx: Typo

Author: javiereguiluz

mailer.rst

@@ -771,7 +771,7 @@ environment:
     If you're using Messenger and routing to a transport, the message will *still*
     be sent to that transport.
 
-Always Send to the Same Address
+Always Send to the same Address
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Instead of disabling delivery entirely, you might want to *always* send emails to