Correct label to be used for asan bugs

The asan documentation says to label asan bugs with
Stability-AddressSanitizer. However, by a vote of 19,870 to 8 it is
clear that Stability-Memory-AddressSanitizer is actually the correct
label.

Change-Id: Id494d25c99b85fdbb180da5af4c66fec2a51e4f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3736150
Reviewed-by: Victor Vianna <victorvianna@google.com>
Auto-Submit: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/main@{#1020035}

docs/asan.md

@@ -141,7 +141,7 @@ to avoid crashes inside gtk.
 `NSS_DISABLE_ARENA_FREE_LIST=1` and `NSS_DISABLE_UNLOAD=1` are required as well.
 
 When filing a bug found by AddressSanitizer, please add a label
-`Stability-AddressSanitizer`.
+`Stability-Memory-AddressSanitizer`.
 
 ## ASan runtime options