Unified: Add QLDoc

Author: asgerf

unified/ql/lib/codeql/unified/Comments.qll

@@ -1,10 +1,15 @@
+/** Provides classes for working with comments. */
+
 private import unified
 
 /**
  * A comment appearing in the source code.
  */
 class Comment extends TriviaToken {
   // At the moment, comments are the only type trivia token we extract
+  /**
+   * Gets the text inside this comment, not counting the delimeters.
+   */
   string getCommentText() {
     result = this.getValue().regexpCapture("//(.*)", 1)
     or