Documentation only (#22760)

- Documentation only.
- Sometimes newbies try to use Valgrind with RefC etc.

doc/mm.md

@@ -73,18 +73,18 @@ Other MM modes
 
 Here is a comparison of the different memory management modes:
 
-================== ======== ================= ============== ====== ===================
-Memory Management Heap Reference Cycles Stop-The-World Atomic Command line switch
-================== ======== ================= ============== ====== ===================
-ORC Shared Cycle Collector No No `--mm:orc`
-ARC Shared Leak No No `--mm:arc`
-Atomic ARC Shared Leak No Yes `--mm:atomicArc`
-RefC Local Cycle Collector No No `--mm:refc`
-Mark & Sweep Local Cycle Collector No No `--mm:markAndSweep`
-Boehm Shared Cycle Collector Yes No `--mm:boehm`
-Go Shared Cycle Collector Yes No `--mm:go`
-None Manual Manual Manual Manual `--mm:none`
-================== ======== ================= ============== ====== ===================
+================== ======== ================= ============== ====== =================== ===================
+Memory Management Heap Reference Cycles Stop-The-World Atomic Valgrind compatible Command line switch
+================== ======== ================= ============== ====== =================== ===================
+ORC Shared Cycle Collector No No Yes `--mm:orc`
+ARC Shared Leak No No Yes `--mm:arc`
+Atomic ARC Shared Leak No Yes Yes `--mm:atomicArc`
+RefC Local Cycle Collector No No No `--mm:refc`
+Mark & Sweep Local Cycle Collector No No No `--mm:markAndSweep`
+Boehm Shared Cycle Collector Yes No No `--mm:boehm`
+Go Shared Cycle Collector Yes No No `--mm:go`
+None Manual Manual Manual Manual Manual `--mm:none`
+================== ======== ================= ============== ====== =================== ===================
 
 .. default-role:: code
 .. include:: rstcommon.rst