[Term Entry] PHP dechex()

[brandon-kong]

Description

• Term entry: Added PHP dechex method in math functions
• Closes Issue [Term Entry] PHP Math Functions dechex() #2622

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.
• Under "Development" on the right, I have linked any issues that are relevant to this PR (write "Closes # in the "Description" above).

[caupolicandiaz]

@brandon-kong @yangc95 Just added a couple of additional edits. Looks good to merge

[github-actions]

👋 @brandon-kong
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