docs: correct typo in "Multiple schemas" example and add tip for bund…

[melissag]

…ling schemas

Changes

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As discussed in #1497; the docs as-written give the impression that multiple schemas can be merged into a single file, as opposed to preserving 1:1 input:output. Fixed the typo, and added the suggested tip linking to Redoly's bundling documentation.

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Checklist

• Unit tests updated N/A
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript) N/A

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[drwpow]

💯 Great fix, thank you!