Fix typos and grammatical errors in app-developers/guides

[devin-ai-integration]

Fix typos and grammatical errors in app-developers/guides

Summary

This PR fixes 3 grammatical errors and typos found during a systematic review of all documentation files in the app-developers/guides folder:

1. messaging.mdx (line 200): Added missing article "the" before "L2 block"

   • "after L2 block" → "after the L2 block"

2. standard-bridge.mdx (lines 71, 157): Fixed typo in parameter description (2 occurrences)

   • "Optional identify extra data" → "Optional identity extra data"

3. get-started.mdx (line 33): Added hyphen to compound adjective

   • "One stop shop" → "One-stop shop"

All changes are purely grammatical/spelling corrections with no changes to technical content, code samples, URLs, or technical terms.

Review & Testing Checklist for Human

• Verify that "identity" is the correct word in standard-bridge.mdx context (vs "identifier" or other alternatives)
• Confirm the grammar fixes improve readability without changing meaning
• Quick scan of the diff to ensure no unintended changes were introduced

Notes

• Reviewed all 17 files in app-developers/guides (including subfolders)
• Only these 3 errors were found and fixed
• No lint tools were available to run (Vale not installed, no lint script in package.json)

Link to Devin run: https://app.devin.ai/sessions/fcef43fb01574ee0881046fbd813488e
Requested by: Ariel Diaz (@aliersh)

[devin-ai-integration]

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