[Term Entry]C++ pointers nullptr

[Radhika-okhade]

Description

A new entry on the Nullptr term under C++ pointers.

Issue Solved

Closes #5645

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.

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