Add Dispatch functions to Your First FA tutorial

[kshitjee]

Description

1. Update grammar on FA section on Dispatchable FA
2. Update Your First FA tutorial to add Dispatchable FA - look at this PR

Checklist

• Do all Lints pass?
  • [x] Have you ran pnpm spellcheck?
  • [x] Have you ran pnpm fmt?
  • [x] Have you ran pnpm lint?

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