Fix Documentation - Separate the subsections in the Tutorial

[SidSaxena01]

This pull request makes a small documentation update to the docs/source/tutorial.rst file.
Previously, all the subsections were under the "Installation" subsection rather than their own separate subsections.
It has now been fixed to have separate subsections as expected.

[Copilot]

Pull Request Overview

This PR fixes the documentation structure in the tutorial by correcting the RestructuredText heading hierarchy. Previously, all subsections were incorrectly nested under the "Installation" section instead of being separate top-level subsections.

• Adds proper spacing to separate the "Installation" subsection from the main "Tutorial" heading
• Ensures subsections appear as independent sections rather than nested under "Installation"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.04%. Comparing base (f61932d) to head (708a970).
⚠️ Report is 15 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #683   +/-   ##
=======================================
  Coverage   97.04%   97.04%           
=======================================
  Files          68       68           
  Lines        7354     7354           
=======================================
  Hits         7137     7137           
  Misses        217      217           

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