Trim redirects section to cross-reference; add validation rules table to fern check docs

Author: fern-api[bot]

fern/products/cli-api-reference/pages/commands.mdx

@@ -328,6 +328,20 @@ hideOnThisPage: true
     fern check --warnings
     ```
 
+    ### Validation rules
+
+    `fern check` runs the following validation rules. Each rule can be set to `"warn"` or `"error"` via [`check.rules`](/learn/docs/configuration/site-level-settings#check-configuration) in `docs.yml`.
+
+    | Rule | Default | Description |
+    |------|---------|-------------|
+    | `broken-links` | `error` | Detects broken internal links and malformed URLs. |
+    | `example-validation` | `warn` | Validates OpenAPI examples against their schemas. |
+    | `no-non-component-refs` | `error` | Flags `$ref` values pointing outside `#/components` in an OpenAPI spec. |
+    | `valid-local-references` | `warn` | Checks that local `$ref` values resolve to existing definitions. |
+    | `no-circular-redirects` | `error` | Detects redirect chains that loop back to a previously visited path. |
+    | `valid-docs-endpoints` | `warn` | Checks that endpoint URLs in `docs.yml` are well-formed. |
+    | `missing-redirects` | `warn` | Flags pages removed or moved without a [redirect](/learn/docs/seo/redirects). Compares against the previously published state. Requires authentication; skipped on first publish. |
+
     ## Usage in a GitHub Action
 
     <CodeBlock title = ".github/workflows/fern-check.yml" >

fern/products/docs/pages/seo/redirects.mdx

@@ -14,19 +14,7 @@ subtitle: Learn how to configure redirects in Fern Docs. Set up exact path redir
 
 ## Catching missing redirects
 
-The `missing-redirects` rule for [`fern check`](/learn/cli-api-reference/commands#check) automatically detects pages that were removed or moved without a redirect. It compares your current docs navigation against the previously published state and warns when a previously published URL would return a 404.
-
-The rule defaults to `warn` severity. To treat missing redirects as errors, configure the rule in `docs.yml`:
-
-```yaml docs.yml
-check:
-  rules:
-    missing-redirects: error
-```
-
-The check requires authentication via `fern login` or the `FERN_TOKEN` environment variable. It is skipped on first publish, when unauthenticated, or when the network is unavailable.
-
-For the full list of `fern check` validation rules, see [Check configuration](/learn/docs/configuration/site-level-settings#check-configuration).
+You can use [`fern check`](/learn/cli-api-reference/commands#check) to automatically detect pages that were removed or moved without a redirect. Configure the [`missing-redirects` rule](/learn/docs/configuration/site-level-settings#check-configuration) in `docs.yml` to control its severity.
 
 <llms-only>
 ## Common errors