Fix typo in doc_fragments path.

test/runner/lib/classification.py

@@ -585,7 +585,7 @@ class PathMapper(object):
                     'units': 'all',
                 }
 
-        if path.startswith('lib/ansible/plugins/docs_fragments/'):
+        if path.startswith('lib/ansible/plugins/doc_fragments/'):
             return {
                 'sanity': 'all',
             }

test/runner/lib/sanity/yamllint.py

@@ -44,7 +44,7 @@ class YamllintTest(SanitySingleVersion):
 
             [i.path for i in targets.include if os.path.splitext(i.path)[1] == '.py' and
              os.path.basename(i.path) != '__init__.py' and
-             i.path.startswith('lib/ansible/plugins/docs_fragments/')],
+             i.path.startswith('lib/ansible/plugins/doc_fragments/')],
         ]
 
         paths = [sorted(p) for p in paths if p]

test/sanity/yamllint/yamllinter.py

@@ -147,7 +147,7 @@ class YamlChecker(object):
             for body_statement in module_ast.body:
                 if isinstance(body_statement, ast.Assign):
                     check_assignment(body_statement, module_doc_types)
-        elif path.startswith('lib/ansible/plugins/docs_fragments/'):
+        elif path.startswith('lib/ansible/plugins/doc_fragments/'):
             for body_statement in module_ast.body:
                 if isinstance(body_statement, ast.ClassDef):
                     for class_statement in body_statement.body: