Merge branch 'pr-1542'

docs/pages/release_notes.md

@@ -33,6 +33,8 @@ This is a {{ site.pmd.release_type }} release.
 
 ### Fixed Issues
 
+*   apex
+    *   [#1542](https://github.com/pmd/pmd/pull/1542): \[apex] Include the documentation category
 *   java-bestpractices
     *   [#658](https://github.com/pmd/pmd/issues/658): \[java] OneDeclarationPerLine: False positive for loops
     *   [#1518](https://github.com/pmd/pmd/issues/1518): \[java] New rule: AvoidReassigningLoopVariable

pmd-apex/src/main/resources/category/apex/categories.properties

@@ -6,6 +6,7 @@ rulesets.filenames=\
     category/apex/bestpractices.xml,\
     category/apex/codestyle.xml,\
     category/apex/design.xml,\
+    category/apex/documentation.xml,\
     category/apex/errorprone.xml,\
     category/apex/performance.xml,\
     category/apex/security.xml