Update error message when using disabled PromQL experimental aggregat…

…ion function

Signed-off-by: Jeanette Tan <[email protected]>

promql/parser/parse.go

@@ -450,7 +450,7 @@ func (p *parser) newAggregateExpr(op Item, modifier, args Node) (ret *AggregateE
 		if !EnableExperimentalFunctions && ret.Op.IsExperimentalAggregator() {
 			// In mimir we return a custom message which doesn't mention the CLI flag that should be used to enable
 			// experimental functions, given it's different (and in SaaS customers don't even have access to it).
-			p.addParseErrf(ret.PositionRange(), "limitk() and limit_ratio() functions are not enabled")
+			p.addParseErrf(ret.PositionRange(), `function "%s" is not enabled`, ret.Op)
 			return
 		}
 		desiredArgs = 2