document which modes work with which themes

Author: ethanpalm

pages.mdx

@@ -62,7 +62,7 @@ title: "Default page title"
 
 ### Wide
 
-Wide mode hides the table of contents. This is useful for pages that do not have any headings or if you prefer to use the extra horizontal space.
+Wide mode hides the table of contents. This is useful for pages that do not have any headings or if you prefer to use the extra horizontal space. Wide mode is available for all themes.
 
 ```yaml
 ---
@@ -73,7 +73,7 @@ mode: "wide"
 
 ### Custom
 
-Custom mode provides a minimalist layout that removes all elements except for the top navbar. Custom mode is a blank canvas to create landing pages or any other unique layouts that you want to have minimal navigation elements for.
+Custom mode provides a minimalist layout that removes all elements except for the top navbar. Custom mode is a blank canvas to create landing pages or any other unique layouts that you want to have minimal navigation elements for. Custom mode is available for all themes.
 
 ```yaml
 ---
@@ -84,7 +84,7 @@ mode: "custom"
 
 ### Center
 
-Center mode removes the sidebar and table of contents, centering the content. This is useful for changelogs or other pages where you want to emphasize the content.
+Center mode removes the sidebar and table of contents, centering the content. This is useful for changelogs or other pages where you want to emphasize the content. Center mode is available for Mint and Linden themes.
 
 ```yaml
 ---