Fix indentation drift for indented code blocks in list items (#19990)

Co-authored-by: fisker <lionkay@gmail.com>

changelog_unreleased/markdown/19647.md

@@ -1,6 +1,4 @@
-#### Prevent indentation drift in task-list code blocks (#19647 by @Austin1serb)
-
-Indented code blocks inside task-list items no longer gain four spaces on each formatting pass.
+#### Prevent indentation drift in list-item code blocks (#19647, #19990 by @Austin1serb, @giaBaoJS)
 
 <!-- prettier-ignore -->
 ```markdown