docs: checklists: Fix googletest issue link

I forgot to fix the markdown markup when I extracted the link reference.

Change-Id: Ia385a7b0708f5f74d5ab463da54b74551dcb1140
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/docs/checklists/changes.md b/docs/checklists/changes.md
index b8a1522..e078212 100644
--- a/docs/checklists/changes.md
+++ b/docs/checklists/changes.md
@@ -127,7 +127,7 @@
 [googletest bug #4232][googletest-issue-4232] you must avoid using GCC 12
 (shipped in Debian Bookworm).
 
-[googletest-issue-4232](https://github.com/google/googletest/issues/4232)
+[googletest-issue-4232]: https://github.com/google/googletest/issues/4232
 
 - [ ] `meson setup -Dabi-compliance-check=disabled build`
 - [ ] `meson compile -C build && meson test -C build`