Update README.md

Co-authored-by: Stephen Lang <[email protected]>

Author: sleepyfoodie

README.md

@@ -62,7 +62,7 @@ The following recording rule is marked deprecated. They will be removed in v2.0.
 ```bash
 node_namespace_pod_container:container_cpu_usage_seconds_total:sum_irate
 ```
-It will be replaced by the following recording rule to preserve data points using `rate` and add `5m` to indicate rate in the recording rule name.
+It will be replaced by the following recording rule to preserve data points using `rate` and add `5m` to indicate the range of the rate query in the recording rule name.
 ```bash
 node_namespace_pod_container:container_cpu_usage_seconds_total:sum_rate5m
 ```