Issue #28139: Fix messed up indentation

Also update the classmethod and staticmethod doc strings and comments to
match the RST documentation.
diff --git a/Objects/funcobject.c b/Objects/funcobject.c
index e6c327d..4cd6590 100644
--- a/Objects/funcobject.c
+++ b/Objects/funcobject.c
@@ -697,8 +697,9 @@
    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 @@
 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 @@
    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 @@
 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\