fixed some broken links

docs/conf.py

@@ -105,11 +105,14 @@
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
 
-# url link checker. Some links are faulty in old release notes, some are just
-# registering as faulty despite being correct.
+# url link checker. Some links registering as faulty, despite being functional.
 # See https://www.sphinx-doc.org/en/1.2/config.html[...]
 # [...]#options-for-the-linkcheck-builder
 
+linkcheck_ignore = [
+    "https://github.com/Scitools/iris-grib/compare"
+    "/c4243ae..5c314e3#diff-cf46b46880cae59e82a91c7ab6bb81ba"
+]
 
 # -- Autodoc ------------------------------------------------------------------