add defaults

Author: chdeskur

fern/products/docs/pages/customization/what-is-docs-yml.mdx

@@ -464,8 +464,8 @@ settings:
   use-javascript-as-typescript: false
 ```
 
-<ParamField path="settings.search-text" type="string" required={false}>
-  The text to display in the searchbar. Defaults to `Search`.
+<ParamField path="settings.search-text" type="string" required={false} default="Search">
+  The text to display in the searchbar.
 </ParamField>
 
 <ParamField path="settings.disable-search" type="boolean" required={false}>

fern/snippets/seo-metadata-site.mdx

@@ -85,4 +85,6 @@ metadata:
 
 <ParamField path="metadata.canonical-host" type="string" required={false}>
   The host of your documentation website. This will be used to set the canonical URL for metadata tags and documents like the sitemap. 
+  
+  Defaults to the URL defined in the `instances` configuration.
 </ParamField>