fix(docs): Correct README comments in logcdf documentation

[ChaitraTM]

Resolves #5715.

Description

What is the purpose of this pull request?

This pull request:

• {{TODO: add description describing what this pull request does}}

Related Issues

Does this pull request have any related issues?

This pull request:

• Moves misplaced reference section from Lines 142-145 to Line 234 in the README.md file.

• Removes an unused #include <math.h> header from example.c.

• Adds a missing closing </section> tag and trailing comment in the README.md file.

• Resolves Address commit comments (commit d269f48) #5715

Questions

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[gururaj1512]

Similar to #5783; This PR includes a submodule.

[stdlib-bot]

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Some common issues include:

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We recommend opening a new pull request with only the intended changes.

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