Add the module path to sys.path (not its parent)

Without a trailing slash, `os.path.dirname` returns a path to the
the parent directory of the path provided, which defeats the point
of adding the module path to sys.path.

Signed-off-by: Abrar Rahman Protyasha <[email protected]>

rosdoc2/verbs/build/builders/sphinx_builder.py

@@ -75,7 +75,7 @@ def ensure_global(name, default):
     # Note: `autodoc` only mocks up those modules that it actually cannot locate in PATH
     autodoc_mock_imports = {exec_depends}
     # Add the package directory to PATH, so that `sphinx-autodoc` can import it
-    sys.path.insert(0, os.path.dirname('{package_src_directory}'))
+    sys.path.insert(0, os.path.dirname('{package_src_directory}/'))
 
 if rosdoc2_settings.get('enable_intersphinx', True):
     print('[rosdoc2] enabling intersphinx', file=sys.stderr)