docs: update developer-guides.mdx with step to apply existing migrations

[Prakalp23]

Description

Updates the developer guide with step to sync the database with the schema.

Type of change

• [x] This change requires a documentation update

How Has This Been Tested?

No tests required.

Checklist:

• [x] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] 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
• [ ] Any dependent changes have been merged and published in downstream modules

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Name	Status	Preview	Comments	Updated (UTC)
revert-client	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 12, 2024 11:08am