[SPARK-15923][YARN] Spark Application rest api returns 'no such app: …
[SPARK-15923][YARN] Spark Application rest api returns 'no such app: …

## What changes were proposed in this pull request?
Update monitoring.md.

…<appId>'

Author: Weiqing Yang <yangweiqing001@gmail.com>

Closes #14163 from Sherry302/master.

(cherry picked from commit 95abbe537751929353d18b733f6267c3287b6047)
Signed-off-by: Sean Owen <291c18f3fb7528c712d9098b0e50a515ea0b91d5@cloudera.com>

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