Clarify language

In the context of scheduling (ie. if you read the page linked to in the paragraph directly above the one edited here), the word "regular" could be taken to mean "frequent". Using the word "common" should be clearer.

Author: steadysupply

lit/docs/resources/versions.lit

@@ -34,7 +34,7 @@ behavior}{https://github.com/concourse/git-resource#check-check-for-new-commits}
 \section{
   \title{Version Pinning}{version-pinning}
 
-  A regular job workflow is to use the latest version of a resource in order to
+  A common job workflow is to use the latest version of a resource in order to
   trigger new builds. This works most of the time until you run into a
   situation where you need to run the job using an old version of a resource.
   Concourse provides a solution to this, which is called resource pinning.