update 'src' attribute content and examples

[romeu-maleiane]

Description

• I updated the documentation of the 'src' attribute inserting new examples, best practices section and FAQ section

Issue Solved

Where #6450 corresponds to the PRs' [Edit] HTML: src

Type of Change

• Updating the documentation

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.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Closing this PR as a different author is assigned to it. 😄

For future references, @romeu-maleiane, please make sure that you first ask to be assigned to an issue by commenting "Claim" on the issue. You can raise a PR once the issue has been assigned to you 😄

[romeu-maleiane]

@mamtawardhani ohh sorry I'm new to contributing to open source projects, next time I'll ask to be assigned to an issue