Add content to workflow.md

Add content from #746 after reviewing on test site.

Author: Amanda Butler

docs/reference/contributing/guidelines/workflow.md

@@ -105,9 +105,9 @@ Refactors are intended for feature releases, if they are not fixing specific iss
 
 Release: feature
 
-#### New target
+#### Target update
 
-Adding a new target is a change for a patch release because it updates the targets folder implementation.
+Updating target implementation (adding a new target or updating already supported target) is a change for a patch release.
 
 Release: patch
 
@@ -119,6 +119,18 @@ We consider adding a new functionality to be a feature. It does not matter if it
 
 Release: feature
 
+#### Documentation update
+
+Documentation updates include changes to markdown files or Doxygen documentation (comment-only changes).
+
+Release: patch
+
+#### Test update
+
+Test updates include updates to a new test unit or test case.
+
+Release: patch
+
 #### Breaking change
 
 A breaking change is any change that results in breaking user space. It should have strong justification for us to consider it. Often, such changes can be backward compatible, for example, deprecating the old functionality and introducing the new replacement.