fix metric name and title

modules/ROOT/pages/platform/metrics-integration.adoc

@@ -387,11 +387,11 @@ This helps avoid unwanted pauses for garbage collection.
 m| MAX
 |===
 
-.Page Cache Hit Ratio
+.Page Cache Hit Ratio (per minute)
 [frame="topbot", stripes=odd, grid="cols", cols="<1,<4"]
 |===
 | Metric name
-m| neo4j_dbms_page_cache_usage_ratio
+m| neo4j_dbms_page_cache_hit_ratio_per_minute
 | Description
 | The percentage of times data required during query execution was found in memory vs needing to be read from disk.
 Ideally the whole graph should fit into memory, and this should consistently be between 98% and 100%.