docs: checklists: Split out note on request and response APIs

Make it stand out a little more while improving consistency of
presentation with respect to other similar notes.

Change-Id: Iac10f0c8c1c813fa19b1bc1dda59fadb3408c990
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/docs/checklists/changes.md b/docs/checklists/changes.md
index b7d7b2a..fdcf690 100644
--- a/docs/checklists/changes.md
+++ b/docs/checklists/changes.md
@@ -120,8 +120,9 @@
 ### API design
 
 - [ ] If I've added support for a new PLDM message type, then I've defined both
-      the encoder and decoder for that message. Note this applies for both
-      request _and_ response message types.
+      the encoder and decoder for that message.
+
+  - This applies for both request _and_ response message types.
 
 - [ ] My new public message codec functions take a `struct` representing the
       message as a parameter