Remove M_LOCK from readme as it is obsolete.

README.md

@@ -6629,26 +6629,6 @@ Unlock the variable mutex of type m\_mutex\_t for exclusive use.
 If the variable is not locked, the behavior is undefined.
 If the variable is not initialized, the behavior is undefined.
 
-##### M\_LOCK\_DECL(name)
-*** Obsolete macros ***
-
-Define the lock 'name'. This shall be called in the global space (reserved for global variables).
-
-##### M\_LOCK(name)
-*** Obsolete macros ***
-
-Use the lock 'name': the encapsulation instructions are protected by the lock.
-Example:
-
-        M_LOCK_DECL(n_lock);
-        unsigned long n = 0;
-        void f(void) {
-             M_LOCK(n_lock) {
-               n ++;
-             }
-        }
-
-
 #### m\_cond\_t
 
 A type representing a conditional variable, used within a mutex section.