[Move Book] Add documentation for op equal

[fEst1ck]

Description

Add documentation for the op equals https://github.com/aptos-labs/aptos-core/pull/14583.

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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Name	Status	Preview	Comments	Updated (UTC)
developer-docs-nextra	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 9, 2024 5:29pm