Added a title to GlobalFunctions.md

[Rooney30]

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Description

Added a title to GlobalFunctions.md so it matched the other .md files.

Fixes #17629

Global Functions Doc Missing Heading

Type of change

• This change requires a documentation update

Checklist:

Dev activity

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] PR is being merged under a feature flag

QA activity:

• [ ] Test plan has been approved by relevant developers
• [ ] Test plan has been peer reviewed by QA
• [ ] Cypress test cases have been added and approved by either SDET or manual QA
• [ ] Organized project review call with relevant stakeholders after Round 1/2 of QA
• [ ] Added Test Plan Approved label after reveiwing all Cypress test

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Name	Status	Preview	Updated
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[mohanarpit]

@Rooney30 Thanks a lot for contributing to Appsmith and making this project a little better for everybody. I've merged this in. 🎉