docs: fix parameter name mismatches in docstrings (#11060)

- repo/experiments/queue/base.py: `scm` -> `repo` in
  BaseStashQueue.__init__ (signature takes a Repo, not an SCM instance)
- repo/experiments/queue/tasks.py: stale `tmp_dir`/`entry_dict` args in
  cleanup_exp replaced with the actual `executor`/`infofile` parameters

dvc/repo/experiments/queue/base.py

@@ -90,7 +90,7 @@ class BaseStashQueue(ABC):
         """Construct a queue.
 
         Arguments:
-            scm: Git SCM instance for this queue.
+            repo: DVC repo instance for this queue.
             ref: Git stash ref for this queue.
             failed_ref: Failed run Git stash ref for this queue.
         """

dvc/repo/experiments/queue/tasks.py

@@ -84,8 +84,8 @@ def cleanup_exp(executor: TempDirExecutor, infofile: str) -> None:
     """Cleanup after an experiment.
 
     Arguments:
-        tmp_dir: Temp directory to be removed.
-        entry_dict: Serialized QueueEntry for this experiment.
+        executor: Executor to clean up.
+        infofile: Path to the executor info file.
     """
     executor.cleanup(infofile)