Fix incomplete sentence and remove double space in handle-api-rate-limits.md

[tblt78]

…mits.md

Why:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Changed "can help handle API rate limits by suggesting code that detects implements retry logic." to:
"can help handle API rate limits by suggesting code that detects them and implements retry logic."

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• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
copilot/tutorials/copilot-chat-cookbook/debug-errors/handle-api-rate-limits.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@tblt78 This is better than what's there now, so I'll take it.

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