Update req.URL.Host to req.Host in AppSec documentation

[Copilot]

The documentation referenced the outdated req.URL.Host field accessor. CrowdSec uses req.Host directly to access the HTTP request's host information.

Changes

Updated 9 occurrences across documentation versions (current, v1.6, v1.7):

• appsec/hooks.md - FQDN access examples
• appsec/configuration.md - Filter expressions in on_match hooks

Example

on_match:
  - filter: req.Host == "staging.example.com"  # was: req.URL.Host
    apply:
      - SetRemediation("allow")

- To get the FQDN: `req.Host`  # was: req.URL.Host

Original prompt

This pull request updates the occurrences of req.Url.Host to req.Host in the crowdsecurity/crowdsec-docs repository. The changes are necessary to reflect the updated usage and ensure code consistency in accessing the HTTP request's host information. Affected files include configurations and hook documentations where the outdated req.Url.Host was used.

This pull request was created from Copilot chat.

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[LaurenceJJones]

feedback crowdsecurity/crowdsec#3837