Update release notes for Gerrit 2.5.2
Update release notes for Gerrit 2.5.2

Describe two more fixes that were merged lately.

Change-Id: Ia3cbe48e2e578beb92f5d5835403931d1e541893
Signed-off-by: Edwin Kempin <b444e279ad95fdef4fbdd82c813b624595df204a@sap.com>

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