Issue #28139: Fix messed up indentation

Also update the classmethod and staticmethod doc strings and comments to
match the RST documentation.
diff --git a/Modules/glmodule.c b/Modules/glmodule.c
index b9c64fb..9609378 100644
--- a/Modules/glmodule.c
+++ b/Modules/glmodule.c
@@ -7624,10 +7624,9 @@
 void
 initgl(void)
 {
-
     if (PyErr_WarnPy3k("the gl module has been removed in "
                        "Python 3.0", 2) < 0)
-    return;
+        return;
 
     (void) Py_InitModule("gl", gl_methods);
 }