Issue #28139: Fix messed up indentation

Also update the classmethod and staticmethod doc strings and comments to
match the RST documentation.

Modules/_localemodule.c

@@ -54,9 +54,10 @@ copy_grouping(char* s)
     int i;
     PyObject *result, *val = NULL;
 
-    if (s[0] == '\0')
+    if (s[0] == '\0') {
         /* empty string: no grouping at all */
         return PyList_New(0);
+    }
 
     for (i = 0; s[i] != '\0' && s[i] != CHAR_MAX; i++)
         ; /* nothing */

Modules/socketmodule.c

@@ -1967,6 +1967,7 @@ getsockaddrlen(PySocketSockObject *s, socklen_t *len_ret)
         return 1;
     }
 #endif /* AF_UNIX */
+
 #if defined(AF_NETLINK)
     case AF_NETLINK:
     {

Objects/funcobject.c

@@ -697,8 +697,9 @@ PyTypeObject PyFunction_Type = {
    To declare a class method, use this idiom:
 
      class C:
-     def f(cls, arg1, arg2, ...): ...
-     f = classmethod(f)
+         @classmethod
+         def f(cls, arg1, arg2, ...):
+             ...
 
    It can be called either on the class (e.g. C.f()) or on an instance
    (e.g. C().f()); the instance is ignored except for its class.
@@ -808,8 +809,9 @@ just like an instance method receives the instance.\n\
 To declare a class method, use this idiom:\n\
 \n\
   class C:\n\
-      def f(cls, arg1, arg2, ...): ...\n\
-      f = classmethod(f)\n\
+      @classmethod\n\
+      def f(cls, arg1, arg2, ...):\n\
+          ...\n\
 \n\
 It can be called either on the class (e.g. C.f()) or on an instance\n\
 (e.g. C().f()).  The instance is ignored except for its class.\n\
@@ -880,8 +882,9 @@ PyClassMethod_New(PyObject *callable)
    To declare a static method, use this idiom:
 
      class C:
-     def f(arg1, arg2, ...): ...
-     f = staticmethod(f)
+         @staticmethod
+         def f(arg1, arg2, ...):
+             ...
 
    It can be called either on the class (e.g. C.f()) or on an instance
    (e.g. C().f()); the instance is ignored except for its class.
@@ -986,8 +989,9 @@ A static method does not receive an implicit first argument.\n\
 To declare a static method, use this idiom:\n\
 \n\
      class C:\n\
-     def f(arg1, arg2, ...): ...\n\
-     f = staticmethod(f)\n\
+         @staticmethod\n\
+         def f(arg1, arg2, ...):\n\
+             ...\n\
 \n\
 It can be called either on the class (e.g. C.f()) or on an instance\n\
 (e.g. C().f()).  The instance is ignored except for its class.\n\