[DOCS] Genericize admission_config_noncm page
[DOCS] Genericize admission_config_noncm page

A couple of fleeting / invisible references to 'cm'.
Take 'em out to avoid false positives in our grep reports.

Change-Id: Ia510a1eb53eba2f1127f57fa1f8bfe39525e0613
Reviewed-on: http://gerrit.cloudera.org:8080/6391
Reviewed-by: Laurel Hale <b820351294b55db843d939b960f387d858ac8480@cloudera.com>
Reviewed-by: John Russell <308573a947c636ab812b35943b6242633bef8113@cloudera.com>
Tested-by: Impala Public Jenkins

cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala