fix error message for resolver params

[Yongxuanzhang]

Changes

This commit is a small fix for resolver params validation. Before this commit we check the resolver params is gated by beta or alpha feature flag, but the error meassage is misleading since params are not only used in resolvers. It would be better to speficy that this is resolver param.

/kind misc

Signed-off-by: Yongxuan Zhang yongxuanzhang@google.com

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[Yongxuanzhang]

/retest

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[jerop]

/lgtm