feat(docs): read only on text area and select input

Author: MaxLardenois

site/src/content/docs/forms/select-input.mdx

@@ -250,7 +250,7 @@ Add the `disabled` boolean attribute on a select to give it a grayed out appeara
     </div>
   </div>`} />
 
-{/* ### Readonly
+{/* ### Read only
 
 Add the `readonly` boolean attribute on an input to prevent modification of the input’s value. `readonly` inputs can still be focused and selected, while `disabled` inputs cannot.
 

site/src/content/docs/forms/text-area.mdx

@@ -149,7 +149,7 @@ Add the `disabled` boolean attribute on a text area to give it a grayed out appe
     </div>
   </div>`} />
 
-### Readonly
+### Read only
 
 Add the `readonly` boolean attribute on a text area to prevent modification of the text area’s value. `readonly` text areas can still be focused and selected, while `disabled` text areas cannot.