docs: checklists: Clean up the language around error codes

The conditional sentence felt a bit redundant given the checklist item
was in the "Adding a new API" section.

Change-Id: I0169e2ace86cab2cf58e1b4336ac76f35ab1b4a9
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/docs/checklists/changes.md b/docs/checklists/changes.md
index 571779c..d3cbc67 100644
--- a/docs/checklists/changes.md
+++ b/docs/checklists/changes.md
@@ -72,8 +72,8 @@
   - Release builds of the library are configured with `assert()` disabled
     (`-Db_ndebug=if-release`, which provides `-DNDEBUG` in `CFLAGS`).
 
-- [ ] If I've implemented a new function, then it returns a negative `errno`
-      value on error and not a PLDM completion code.
+- [ ] My new APIs return negative `errno` values on error and not PLDM
+      completion codes.
 
   - [ ] The specific error values my function returns and their meaning in the
         context of the function call are listed in the API documentation.