Fix small typo in docs
@@ -165,7 +165,7 @@ While the following would be *incorrect*:
sum(http_requests_total{method="GET"}) offset 5m // INVALID.
-The same works for range vectors. This returns the 5-minutes rate that
+The same works for range vectors. This returns the 5-minute rate that
`http_requests_total` had a week ago:
rate(http_requests_total[5m] offset 1w)
