docs: Fix broken link in configuration-options.md (#24143)

Co-authored-by: Rhys Arkins <rhys@arkins.net>

docs/usage/configuration-options.md

@@ -3041,7 +3041,7 @@ We recommend you use only one of these methods, or you'll get confused.
 We recommend that you also tell Renovate what `versioning` to use.
 If the `versioning` field is missing, then Renovate defaults to using `semver` versioning.
 
-For more details and examples, see our [documentation for the `regex` manager](/modules/manager/regex/index.md).
+For more details and examples, see our [documentation for the `regex` manager](/modules/manager/regex/).
 For template fields, use the triple brace `{{{ }}}` notation to avoid Handlebars escaping any special characters.
 
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