fix typo in usage message for querier.split-queries-by-interval flag (#6305)

Author: CharlieTLe

docs/configuration/config-file-reference.md

@@ -4069,8 +4069,8 @@ The `query_range_config` configures the query splitting and caching in the Corte
 
 ```yaml
 # Split queries by an interval and execute in parallel, 0 disables it. You
-# should use an a multiple of 24 hours (same as the storage bucketing scheme),
-# to avoid queriers downloading and processing the same chunks. This also
+# should use a multiple of 24 hours (same as the storage bucketing scheme), to
+# avoid queriers downloading and processing the same chunks. This also
 # determines how cache keys are chosen when result caching is enabled
 # CLI flag: -querier.split-queries-by-interval
 [split_queries_by_interval: <duration> | default = 0s]

pkg/querier/tripperware/queryrange/query_range_middlewares.go

@@ -49,7 +49,7 @@ type Config struct {
 // RegisterFlags adds the flags required to config this to the given FlagSet.
 func (cfg *Config) RegisterFlags(f *flag.FlagSet) {
 	f.IntVar(&cfg.MaxRetries, "querier.max-retries-per-request", 5, "Maximum number of retries for a single request; beyond this, the downstream error is returned.")
-	f.DurationVar(&cfg.SplitQueriesByInterval, "querier.split-queries-by-interval", 0, "Split queries by an interval and execute in parallel, 0 disables it. You should use an a multiple of 24 hours (same as the storage bucketing scheme), to avoid queriers downloading and processing the same chunks. This also determines how cache keys are chosen when result caching is enabled")
+	f.DurationVar(&cfg.SplitQueriesByInterval, "querier.split-queries-by-interval", 0, "Split queries by an interval and execute in parallel, 0 disables it. You should use a multiple of 24 hours (same as the storage bucketing scheme), to avoid queriers downloading and processing the same chunks. This also determines how cache keys are chosen when result caching is enabled")
 	f.BoolVar(&cfg.AlignQueriesWithStep, "querier.align-querier-with-step", false, "Mutate incoming queries to align their start and end with their step.")
 	f.BoolVar(&cfg.CacheResults, "querier.cache-results", false, "Cache query results.")
 	f.Var(&cfg.ForwardHeaders, "frontend.forward-headers-list", "List of headers forwarded by the query Frontend to downstream querier.")