[Edit] C++: strings

[codecademy-docs]

Type of Edit (select all that apply)

Add new content (definitions, codeblocks, etc.)

Description (optional)

We would like to edit the Strings term entry in C++. The entry lives in content/cpp/concepts/strings/strings.md.

Please refer to the term entry template, content standards, and markdown style guide when working on the PR for this issue.

Please:

• Add advantages and use cases
• Add best practices and/or a FAQ section

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