[Ruleset Engine] Fix field name

[pedrosousa]

Summary

Fixes field name in example rule expression.
Closes #20863.

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PR Change Summary

Fixed the field name in an example rule expression for clarity and accuracy.

• Corrected the field name from 'host' to 'http.host' in the example rule expression.

Modified Files

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

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[github-actions]

Preview URL: https://f236ad51.preview.developers.cloudflare.com
Preview Branch URL: https://pedro-issue20863-fix-field-name.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/ruleset-engine/rules-language/expressions/	https://pedro-issue20863-fix-field-name.preview.developers.cloudflare.com/ruleset-engine/rules-language/expressions/