Fix grammar in config/mail.php
Added redis to list of available queue drivers
Add note about expire time

Might be confusing for users, if the expire time is not stated.
Merge pull request #2929 from barryvdh/patch-3

Add note about expire time
Merge pull request #2854 from seeARMS/patch-1

Added redis to list of available queue drivers
Merge pull request #2853 from anewmanjones/patch-1

Fix grammar in config/mail.php
Fix wording.
Merge branch 'master' into develop