Minor update (jobId -> jobName) (hazelcast#1028)

As per https://github.com/hazelcast/hazelcast/pull/23744/files

docs/modules/ROOT/pages/list-of-metrics.adoc

@@ -67,9 +67,9 @@ cooperative worker threads.
 .Streaming Engine Job-specific Metrics
 [%collapsible]
 ====
-All job specific metrics have their `job=<jobId>` and
-`exec=<executionId>` tags set and most also have the
-`vertex=<vertexName>` tag set (with very few exceptions). This means
+All job specific metrics have their `job` (name and ID of the job) and
+`exec`(job execution ID) tags set, and most also have the
+`vertex` (vertex name) tag set (with very few exceptions). This means
 that most of these metrics will have at least one instance for each
 vertex of each current job execution.