Follow up to r1831869: update CHANGES entry.
Changes with Apache 2.5.1
*) mod_slotmem_shm: Add generation number to shm filename to fix races
- with graceful restarts. PR 62044. [Jim Jagielski, Yann Ylavic]
+ with graceful restarts. PRs 62044 and 62308. [Jim Jagielski, Yann Ylavic]
*) mod_rewrite: Only create the global mutex used by "RewriteMap prg:" when
this type of map is present in the configuration. PR62311.
