GOVERNANCE: Fix "motion to release" link target (to RELEASES.md)

I'd garbled the old '#release-approval' target in c732cc2
(project-governance: Make voting more generic, 2016-06-24, #15).

Signed-off-by: W. Trevor King <wking@tremily.us>

GOVERNANCE.md

@@ -29,7 +29,7 @@ However, a motion MAY be adopted with REJECTs, as outlined in the previous parag
 
 A quorum is established when at least two-thirds of maintainers have voted.
 
-For projects that are not specifications, a [motion to release](#release-approval) MAY be adopted if the tally is at least three LGTMs and no REJECTs, even if three votes does not meet the usual two-thirds quorum.
+For projects that are not specifications, a [motion to release](RELEASES.md) MAY be adopted if the tally is at least three LGTMs and no REJECTs, even if three votes does not meet the usual two-thirds quorum.
 
 ## Security issues