updated comments

Author: venom1204

.ci/atime/tests.R

@@ -300,8 +300,8 @@ test.list <- atime::atime_test_list(
       data.table::tables(env = test_env, silent = TRUE, index = TRUE)
       NULL
     },
-    before = "2b191aec3df51675a7ab5e6701384a8b89470af6",  # The merge-base parent commit for PR #2606
-    after =  "66024e6ea5304ae059b18c71de9973715ddb77ce"),   # The final commit of PR #2606
+    before = "2b191aec3df51675a7ab5e6701384a8b89470af6",  # Merge-base parent commit for PR #2606 (https://github.com/Rdatatable/data.table/commit/2b191aec3df51675a7ab5e6701384a8b89470af6
+    after  = "66024e6ea5304ae059b18c71de9973715ddb77ce"),   # Commit in the PR (https://github.com/Rdatatable/data.table/pull/7141/commits) 
 
     tests=extra.test.list)
 # nolint end: undesirable_operator_linter.