Added count for Cpp

[RashmitTopG]

Description

Added term entry for cpp.count()

Issue Solved

#5475

Added a new term entry for cpp.count() in unordered_map

Type of Change

• Adding a new entry

Checklist

• [✓] All writings are my own.
• [✓] My entry follows the Codecademy Docs style guide.
• [✓] My changes generate no new warnings.
• [✓] I have performed a self-review of my own writing and code.
• [✓] I have checked my entry and corrected any misspellings.
• [✓] I have made corresponding changes to the documentation if needed.
• [✓] I have confirmed my changes are not being pushed from my forked main branch.
• [✓] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [✓] I have linked any issues that are relevant to this PR in the Issues Solved section.

[RashmitTopG]

@cigar-galaxy82 can you review this PR ??

[cigar-galaxy82]

Hi @RashmitTopG thank you for contributing to Codecademy docs, I have suggested a few changes please modify them.

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