Fix copyAllScoresOnMergeFirstParentUpdate's documentation

The proper name for this config is
"copyAllScoresOnMergeFirstParentUpdate" and not
"copyAllScoresOnMergeCommitFirstParentUpdate", as defined in
ProjectConfig.

Change-Id: I9a16d585784c1fa3e9951e2c4b312cbeb522ba0f
diff --git a/Documentation/config-labels.txt b/Documentation/config-labels.txt
index 91e20cd..cf78c6d 100644
--- a/Documentation/config-labels.txt
+++ b/Documentation/config-labels.txt
@@ -275,8 +275,8 @@
 sticky approvals, reducing turn-around for trivial cleanups prior to
 submitting a change. Defaults to false.
 
-[[label_copyAllScoresOnMergeCommitFirstParentUpdate]]
-=== `label.Label-Name.copyAllScoresOnMergeCommitFirstParentUpdate`
+[[label_copyAllScoresOnMergeFirstParentUpdate]]
+=== `label.Label-Name.copyAllScoresOnMergeFirstParentUpdate`
 
 This policy is useful if you don't want to trigger CI or human
 verification again if your target branch moved on but the feature