Add blank line

Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>

content/proposals.md

@@ -463,7 +463,7 @@ vendor prefix in Java package naming format. For example:
 {{% boxes/note %}}
 Proposal authors operating with a Matrix.org Foundation mandate SHOULD use
 a vendor prefix within the `org.matrix` namespace. This namespace is otherwise
-restricted. Authors who don't own a domain MAY use the `com.github` namespace
+restricted. Authors who don't own a domain MAY use the `io.github` namespace
 instead.
 {{% /boxes/note %}}
 
@@ -489,6 +489,7 @@ Vendor prefixes MUST also be used for:
       ...
     }
     ```
+
 -   New values for existing parameters or properties. For example:
 
     ```json