doc: remove sphinx-quickstart redundant comments

These are not useful.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

Author: gmarull

doc/index.rst

@@ -1,8 +1,3 @@
-.. Example Application documentation master file, created by
-   sphinx-quickstart on Wed Apr  3 15:28:39 2024.
-   You can adapt this file completely to your liking, but it should at least
-   contain the root `toctree` directive.
-
 Welcome to Example Application's documentation!
 ===============================================