Loki: Improve error message when step too low (#9641)

**What this PR does / why we need it**:

In grafana/grafana#69648 we are in Grafana
introducing a step editor in Loki. Unfortunately, the error message when
user sets too low step parameter is hard to understand, so I am
proposing following change to make it more understandable and
actionable.

Let me know what do you think.

---------

Co-authored-by: J Stickler <julie.stickler@grafana.com>

pkg/loghttp/query.go

@@ -18,7 +18,7 @@ import (
 var (
 	errEndBeforeStart   = errors.New("end timestamp must not be before or equal to start time")
 	errNegativeStep     = errors.New("zero or negative query resolution step widths are not accepted. Try a positive integer")
-	errStepTooSmall     = errors.New("exceeded maximum resolution of 11,000 points per timeseries. Try decreasing the query resolution (?step=XX)")
+	errStepTooSmall     = errors.New("exceeded maximum resolution of 11,000 points per time series. Try increasing the value of the step parameter")
 	errNegativeInterval = errors.New("interval must be >= 0")
 )
 

pkg/querier/queryrange/queryrangebase/query_range.go

@@ -38,7 +38,7 @@ var (
 	}.Froze()
 	errEndBeforeStart = httpgrpc.Errorf(http.StatusBadRequest, "end timestamp must not be before start time")
 	errNegativeStep   = httpgrpc.Errorf(http.StatusBadRequest, "zero or negative query resolution step widths are not accepted. Try a positive integer")
-	errStepTooSmall   = httpgrpc.Errorf(http.StatusBadRequest, "exceeded maximum resolution of 11,000 points per timeseries. Try decreasing the query resolution (?step=XX)")
+	errStepTooSmall   = httpgrpc.Errorf(http.StatusBadRequest, "exceeded maximum resolution of 11,000 points per time series. Try increasing the value of the step parameter")
 
 	// PrometheusCodec is a codec to encode and decode Prometheus query range requests and responses.
 	PrometheusCodec Codec = &prometheusCodec{}