Writing documentation related to SPI slave.

[FelipeMdeO]

This documentation refers to PR: https://github.com/apache/nuttx-apps/pull/2765

[nuttxpr]

[Experimental Bot, please feedback here]

Fill In The Commit Message: This PR contains a Commit with an Empty Commit Message. Please fill in the Commit Message with the PR Summary.

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[acassis]

@FelipeMdeO please fix the issue:

/home/runner/work/nuttx/nuttx/Documentation/applications/examples/spislv_test/index.rst:2:Title underline too short.

[cederom]

Ah, typo in underline syntax (one = missing):

Warning, treated as error:
/home/runner/work/nuttx/nuttx/Documentation/applications/examples/spislv_test/index.rst:2:Title underline too short.

``spislv`` SPI slave example
===========================
make: *** [Makefile:47: html] Error 2

[FelipeMdeO]

Hello @cederom.

I am sending documentation again, now I take care with build issues and improve text, following @acassis instructions.