docs: checklists: Add expectations for bug fixes

Tests and a Fixes: tag in the commit message are a must.

Change-Id: I2a21e844082f947ebf1a089326d7002bf87582b8
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/docs/checklists/changes.md b/docs/checklists/changes.md
index 7781052..7382178 100644
--- a/docs/checklists/changes.md
+++ b/docs/checklists/changes.md
@@ -283,3 +283,14 @@
 
 - [ ] I've updated the ABI dump to capture the rename, or will mark the change
       as WIP until it has been.
+
+## Fixing Implementation Defects
+
+- [ ] My change fixing the bug includes a [Fixes tag][linux-kernel-fixes-tag]
+      identifying the change introducing the defect.
+
+[linux-kernel-fixes-tag]:
+  https://docs.kernel.org/process/submitting-patches.html#describe-your-changes
+
+- [ ] My change fixing the bug includes test cases demonstrating that the bug is
+      fixed.