Replaced Broken Link for Computer Networking Resource

[HariharaSubramanianM]

What does this PR do?

The PR fixes a broken link to one of the listed books

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For resources

Description

The link to the book: [Computer Networking : Principles, Protocols and Practice], redirected to an invalid URL (Error 404)
Fixed the issue with the proper link to the referred book

Why is this valuable (or not)?

Since this is a key resource, replacing the link would ensure proper redirecting for the users

Checklist:

• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-subjects.md
701:3-701:100  warning  Remove trailing slash (https://www.computer-networking.info)  no-url-trailing-slash  remark-lint