Merge branch 'stable-2.10'

* stable-2.10:
  Update 2.10 release notes
  Re-enable the Cherry Pick button when cancelled

Conflicts:
	gerrit-gwtui/src/main/java/com/google/gerrit/client/change/CherryPickAction.java

Change-Id: Ida1b759ef46b2de808e56568f43bff9b2b21fd79