[Ruleset Engine] Fix concat() documentation

[pedrosousa]

Summary

Addresses PCX-17845.

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Updated the documentation for the concat() function to clarify its return type and provide more accurate examples.

• Modified the return type description of the concat() function to include arrays.
• Updated the example for the concat() function to reflect the correct input types.

Modified Files

• src/content/docs/ruleset-engine/rules-language/functions.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/ruleset-engine/	@pedrosousa, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://cb95ed10.preview.developers.cloudflare.com
Preview Branch URL: https://pedro-pcx-17845-fix-concat-function.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/ruleset-engine/rules-language/functions/	https://pedro-pcx-17845-fix-concat-function.preview.developers.cloudflare.com/ruleset-engine/rules-language/functions/