[Committed, PATCH] Update HOWTO_MERGE file for libsanitizer.

[Maxim Ostapenko]

This patch updates libsanitizer/HOWTO_MERGE file according to Yura's 
nits here: https://gcc.gnu.org/ml/gcc-patches/2015-10/msg02039.html.

Just a documentation patch, no changes in functionality.

-Maxim
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