Bug 1302192: require headings to begin a line; r=hammad13060+583205

MozReview-Commit-ID: 4me4VI8Si0h

--HG--
extra : rebase_source : 0bcb53df1973e47d8915fd38e943633cc9706e4f

taskcluster/taskgraph/util/verify.py

@@ -24,7 +24,7 @@ def verify_docs(filename, identifiers, appearing_as):
             ]
         elif appearing_as == "heading":
             expression_list = [
-                identifier + "\n(?:(?:(?:-+\n)+)|(?:(?:.+\n)+))"
+                '\n' + identifier + "\n(?:(?:(?:-+\n)+)|(?:(?:.+\n)+))"
                 for identifier in identifiers
                 if not identifier.startswith("_")
             ]