Fix documentation typos

[latent-9]

A few small documentation typos noticed while reading the docs:

• architecture/using-composer.md: "from the the boot() method" -> "from the boot() method"
• backend/controllers-ajax.md: "resides in the the /controllers subdirectory" -> "... in the /controllers subdirectory"
• backend/controllers-ajax.md: "a reference to the the backend user object" -> "... to the backend user object"
• snowboard/extras.md: "overriden" -> "overridden"
• snowboard/extras.md: "from the the defaults" -> "from the defaults"
• snowboard/request.md: "errors occuring" -> "errors occurring"
• backend/forms.md: "is occuring" -> "is occurring"

Documentation only; no code changes.

Summary by CodeRabbit

• Documentation
  • Corrected spelling, grammar, and duplicated wording across Composer, backend, and Snowboard documentation.
  • Clarified descriptions for plugin registration, controllers, form events, configuration lookup, and error handling.
  • Improved consistency and readability without changing documented functionality.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 43af8004-bfcb-4e42-9103-883270d7e785

📥 Commits

Reviewing files that changed from the base of the PR and between 032e218 and 8778d05.

📒 Files selected for processing (5)

• architecture/using-composer.md
• backend/controllers-ajax.md
• backend/forms.md
• snowboard/extras.md
• snowboard/request.md

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Walkthrough

Corrected duplicated wording and spelling errors across five documentation pages. The changes update Composer registration guidance, controller descriptions, form model-event notes, configuration documentation, and the handleErrorMessage option description. No public declarations, option signatures, or behavior changed.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the pull request, which corrects spelling errors and duplicated words in documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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