[MINOR][DOC] ADD toc for monitoring page

### What changes were proposed in this pull request? Add toc tag on monitoring.md ### Why are the changes needed? fix doc ### Does this PR introduce _any_ user-facing change? yes, the table of content of the monitoring page will be shown on the official doc site. ### How was this patch tested? pass GA doc build Closes #32545 from yaooqinn/minor. Authored-by: Kent Yao <[email protected]> Signed-off-by: Kent Yao <[email protected]>
apache · May 14, 2021 · d424771 · d424771
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diff --git a/docs/monitoring.md b/docs/monitoring.md
@@ -19,6 +19,9 @@ license: |
   limitations under the License.
 ---
 
+* This will become a table of contents (this text will be scraped).
+{:toc}
+
 There are several ways to monitor Spark applications: web UIs, metrics, and external instrumentation.
 
 # Web Interfaces