[SPARK-595][DOCS] Add local-cluster mode option in Documentation
[SPARK-595][DOCS] Add local-cluster mode option in Documentation

### What changes were proposed in this pull request?

Add local-cluster mode option to submitting-applications.md

### Why are the changes needed?

Help users to find/use this option for unit tests.

### Does this PR introduce _any_ user-facing change?

Yes, docs changed.

### How was this patch tested?

`SKIP_API=1 bundle exec jekyll build`
<img width="460" alt="docchange" src="https://user-images.githubusercontent.com/87687356/127125380-6beb4601-7cf4-4876-b2c6-459454ce2a02.png">

Closes #33537 from yutoacts/SPARK-595.

Lead-authored-by: Yuto Akutsu <1c5eb9c01483db9a7c7ede8ddfc9fb2c3578ed75@jp.nttdata.com>
Co-authored-by: Yuto Akutsu <1c5eb9c01483db9a7c7ede8ddfc9fb2c3578ed75@nttdata.com>
Co-authored-by: Yuto Akutsu <a89804cacc6d04b6b2954077efec8cd47959c60b@users.noreply.github.com>
Signed-off-by: Thomas Graves <a1a405b82800b492a7268cba6bc58270d2b527de@apache.org>
(cherry picked from commit 41b011e416286374e2e8e8dea36ba79f4c403040)
Signed-off-by: Thomas Graves <a1a405b82800b492a7268cba6bc58270d2b527de@apache.org>

milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark