Correct a wrong spelling

"abolute" -> "absolute"

doc/install/requirements.md

@@ -53,7 +53,7 @@ We love [JRuby](http://jruby.org/) and [Rubinius](http://rubini.us/)) but GitLab
 
 ## Memory
 
-- 512MB is the abolute minimum, you need 256MB of swap, you can configure only one slow unicorn worker, only ssh access will work, we do not recommend this
+- 512MB is the absolute minimum, you need 256MB of swap, you can configure only one slow unicorn worker, only ssh access will work, we do not recommend this
 - 1GB supports up to 100 users (with individual repositories under 250MB, otherwise git memory usage necessitates using swap space)
 - **2GB** is the **recommended** memory size and supports up to 500 users
 - 4GB supports up to 2,000 users