fix(docs): remove stray + chars in inbound integration frontmatter

[ibrahim123-sia]

The title and description keys in the YAML frontmatter were prefixed with + (leftover diff markers from a previous patch), making them +title and +description. The docs site can't pick those up, leaving the page without a proper title or description.

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Summary by cubic

Restored the Inbound integration docs title and description by fixing the YAML frontmatter. Removed stray + prefixes from the title and description keys in apps/docs/integrations/inbound.mdx so the page metadata renders correctly.

^{Written for commit bbcb9e4. Summary will update on new commits.}

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Latest commit: bbcb9e4

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Auto-approved: Trivial fix removing stray diff marker characters from YAML frontmatter in docs. No logic changes, extremely low risk.}