zap-time-encoding help text still says the default is 'epoch' #3634

Since #2029, the zap logger defaults to RFC3339 timestamps (o.TimeEncoder = zapcore.RFC3339TimeEncoder in pkg/log/zap/zap.go). The --zap-time-encoding flag help and the BindFlags doc comment still say "Defaults to 'epoch'", though.

I ran into this with an operator built on v0.24.1. Its --help says "Defaults to 'epoch'.", but with the flag unset the logs come out as 2026-10-31T17:23:56-07:00.

Both strings just need to say 'rfc3339'. I'm happy to send a PR for it.