docs: Fix incorrect submission FAQ formatting

Add spacing between lines to support proper inline code formatting.

Author: Nessworthy

docs/guides/form-submission.md

@@ -60,6 +60,9 @@ If `isValidating` is `true` and `isSubmitting` is `true`.
 
 <details>
 <summary>Why does isSubmitting remain true after submission?</summary>
-  If the submission handler returns a promise, make sure it is correctly resolved or rejected when called.
-  If the submission handler does not return a promise, make sure `setSubmitting(false)` is called at the end of the handler.
+  
+If the submission handler returns a promise, make sure it is correctly resolved or rejected when called.
+
+If the submission handler does not return a promise, make sure `setSubmitting(false)` is called at the end of the handler.
+
 </details>