Improved language in mutations docs

[KyeRussell]

One point in the mutations docs had a typo, and was generally awkwardly worded. I've fixed the typo and attempted to improve it more broadly.

Description

As above.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

Issues Fixed or Closed by This PR

None

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

Summary by Sourcery

Documentation:

• Correct a typo in the mutations documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This is a simple documentation fix that corrects a typographical error in the mutations guide. The change replaces "I's" with "It's" in the documentation text.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Fixed a grammatical error in the mutations documentation	Corrected 'I's' to 'It's' in the documentation text about model updates using unique identifiers	docs/guide/mutations.md

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[sourcery-ai]

Hey @KyeRussell - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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