Update 04-Review_Old_Backup_and_Unreferenced_Files_for_Sensitive_Information.md

[jinsonvarghese]

What did this PR accomplish?

• Improved readability
• Addressed informal tone

[github-actions[bot]]

The following mistakes were identified:

/home/runner/work/wstg/wstg/document/4-Web_Application_Security_Testing/02-Configuration_and_Deployment_Management_Testing/04-Review_Old_Backup_and_Unreferenced_Files_for_Sensitive_Information.md 111:94 ✖ Incorrect usage of the term: “html”, use “HTML” instead terminology 128:28 ✖ Incorrect usage of the term: “Internet”, use “internet” instead terminology 130:72 ✖ Incorrect usage of the term: “Internet”, use “internet” instead terminology 130:169 ✖ Incorrect usage of the term: “website”, use “site” instead terminology 132:99 ✖ Incorrect usage of the term: “websites”, use “sites” instead terminology 132:314 ✖ Incorrect usage of the term: “web sites”, use “sites” instead terminology 181:27 ✖ Incorrect usage of the term: “web site”, use “site” instead terminology