Use required syntax for method name exclusion (#4233)

Add more comments that explain the reason for the test exclusion.

* jenkinsci/git-client-plugin#1242

excludes.txt

@@ -19,6 +19,8 @@ org.jenkinsci.plugins.durabletask.BourneShellScriptTest
 # TODO tends to run out of memory
 org.jenkinsci.plugins.pipeline.modeldefinition.TriggersTest
 
-# TODO need this to ignore for git-client 2.452.x/2.462.x for the 2024-01-17 bom release. 
+# TODO need this to ignore for git-client 2.452.x/2.462.x
+# TODO Remove when 2.462.x and 2.452.x are no longer supported BOM lines
 # TODO Real fix is in 6.1.1 but 2.452.x and 2.462.x only supports 5.0.0
-org.jenkinsci.plugins.gitclient.GitAPITest.testListRemoteBranches
+# TODO https://github.com/jenkinsci/git-client-plugin/pull/1242
+org.jenkinsci.plugins.gitclient.GitAPITest#testListRemoteBranches