chore: address comments from commit d269f48

[NEEKUorAAYUSH]

Description

This pull request addresses the 4 comments left on commit d269f48:

1. Move lines 142-145 down to line 234 in README.md.
2. Remove unused headers in README.md and example.c.
3. Add missing closing </section> and trailing comment in README.md.

Related Issues

This pull request:

• resolves Address commit comments (commit d269f48) #5715

Questions

No questions for reviewers.

Other

No additional information.

Checklist

• Read, understood, and followed the contributing guidelines

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/geometric/logcdf	$\color{green}295/295$ $\color{green}+100.00\%$	$\color{green}27/27$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}295/295$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

LGTM after clean-up.