[Added] Lua Strings: .len()

[ivaaane]

Description

Added a new doc in Lua's strings documentation for the built-in function .len()

While doing the Lua course, it is required to use this function and it was strange to me that it wasn't already in the documentation; that's why I'm adding it.

Issue Solved

Closes #4793

Type of Change

• Adding a new entry

Checklist

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

[Sriparno08]

Hey @ivaaane, please ask to be assigned to this issue that corresponds to this PR: [Term Entry] Lua Strings: .len()

Once you are assigned, we'll start reviewing the PR.

[ivaaane]

@Sriparno08 Oops- Sorry-

[Sriparno08]

Hey @ivaaane, it's been a week and you haven't made the suggested changes yet. Please make them so that we can move on with the review.

Please note that if the changes are not made within a week, this PR will be closed and you will be unassigned from the corresponding issue unfortunately.

[ivaaane]

Sorry 🥲 I think it's done now (please tell if there is more to do)

[ivaaane]

@letsbuildanything all good, thanks!!

[github-actions[bot]]

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