fix a typo dont -> dont't
@@ -249,7 +249,7 @@ func tuplesByPrefix(m *labels.PrefixMatcher, ts StringTuples) ([]string, error)
}
func postingsForMatcher(ix IndexReader, m labels.Matcher) (index.Postings, error) {
- // If the matcher selects an empty value, it selects all the series which dont
+ // If the matcher selects an empty value, it selects all the series which don't
// have the label name set too. See: https://github.com/prometheus/prometheus/issues/3575
// and https://github.com/prometheus/prometheus/pull/3578#issuecomment-351653555
if m.Matches("") {
