Merge branch 'docs-spelling-error' into 'master'

Fixed spelling mistake in install docs

Fixed spelling mistake of this.

[ci skip]

See merge request !404

doc/install/requirements.md

@@ -76,7 +76,7 @@ Notice: The 25 workers of Sidekiq will show up as separate processes in your pro
 
 ## Unicorn Workers
 
-It's possible to increase the amount of unicorn workers and tis will usually help for to reduce the response time of the applications and increase the ability to handle parallel requests.
+It's possible to increase the amount of unicorn workers and this will usually help for to reduce the response time of the applications and increase the ability to handle parallel requests.
 
 For most instances we recommend using: CPU cores + 1 = unicorn workers.
 So for a machine with 2 cores, 3 unicorn workers is ideal.