Link to Vale rule searches

doc/.vale/gitlab/CurlStringsQuoted.yml

 ---
-# Warning: gitlab.CurlStringsQuoted
+# Error: gitlab.CurlStringsQuoted
 #
 # Ensures all code blocks using curl quote any URL strings.
 #

doc/development/documentation/testing.md

@@ -183,7 +183,8 @@ Vale configuration is found in the following projects:
 - [`charts`](https://gitlab.com/gitlab-org/charts/gitlab/-/tree/master/doc/.vale/gitlab)
 - [`gitlab-development-kit`](https://gitlab.com/gitlab-org/gitlab-development-kit/-/tree/master/doc/.vale/gitlab)
 
-This configuration is also used within build pipelines.
+This configuration is also used within build pipelines, where
+[error-level rules](#vale-result-types) are enforced.
 
 You can use Vale:
 
@@ -197,14 +198,17 @@ You can use Vale:
 Vale returns three types of results: `suggestion`, `warning`, and `error`:
 
 - **Suggestion**-level results are writing tips and aren't displayed in CI
-  job output. Suggestions don't break CI.
+  job output. Suggestions don't break CI. See a list of
+  [suggestion-level rules](https://gitlab.com/search?utf8=✓&snippets=false&scope=&repository_ref=master&search=path%3Adoc%2F.vale%2Fgitlab+Suggestion%3A&group_id=9970&project_id=278964).
 - **Warning**-level results are [Style Guide](styleguide/index.md) violations, aren't displayed in CI
   job output, and should contain clear explanations of how to resolve the warning.
   Warnings may be technical debt, or can be future error-level test items
-  (after the Technical Writing team completes its cleanup). Warnings don't break CI.
+  (after the Technical Writing team completes its cleanup). Warnings don't break CI. See a list of
+  [warning-level rules](https://gitlab.com/search?utf8=✓&snippets=false&scope=&repository_ref=master&search=path%3Adoc%2F.vale%2Fgitlab+Warning%3A&group_id=9970&project_id=278964).
 - **Error**-level results are Style Guide violations, and should contain clear explanations
   about how to resolve the error. Errors break CI and are displayed in CI job output.
-  of how to resolve the error. Errors break CI and are displayed in CI job output.
+  of how to resolve the error. Errors break CI and are displayed in CI job output. See a list of
+  [error-level rules](https://gitlab.com/search?utf8=✓&snippets=false&scope=&repository_ref=master&search=path%3Adoc%2F.vale%2Fgitlab+Error%3A&group_id=9970&project_id=278964).
 
 ### Install linters