Document WRANGLER_LOG_PATH system environment variable

[benjreinhart]

I see this option in the Changelog and in the source, but not in the docs.

Documentation checklist

• The documentation style guide has been adhered to.

I took some of the same language from the Changelog entry.

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PR Change Summary

Documented the WRANGLER_LOG_PATH system environment variable to enhance logging capabilities in Wrangler.

• Added documentation for the WRANGLER_LOG_PATH variable.
• Specified usage for file and directory paths for logging.
• Included examples of setting the WRANGLER_LOG_PATH variable.

Modified Files

• src/content/docs/workers/wrangler/system-environment-variables.mdx

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[petebacondarwin]

Couple of minor suggestions