Remove duplicated word on workflows docs

[Caio-Nogueira]

Summary

Remove typo on documentation

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Corrected a typo in the workflows documentation by removing duplicated words.

• Removed duplicated word in the documentation regarding workflows retry behavior.
• Updated references to the documentation on sleeping and retrying for clarity.

Modified Files

• src/content/docs/workflows/build/workers-api.mdx

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