Update cache comments (ultralytics#8414)

* Update cache comments

For better readability

* Update dataloaders.py

utils/dataloaders.py

@@ -449,10 +449,10 @@ def __init__(self,
         cache_path = (p if p.is_file() else Path(self.label_files[0]).parent).with_suffix('.cache')
         try:
             cache, exists = np.load(cache_path, allow_pickle=True).item(), True  # load dict
-            assert cache['version'] == self.cache_version  # same version
-            assert cache['hash'] == get_hash(self.label_files + self.im_files)  # same hash
+            assert cache['version'] == self.cache_version  # matches current version
+            assert cache['hash'] == get_hash(self.label_files + self.im_files)  # identical hash
         except Exception:
-            cache, exists = self.cache_labels(cache_path, prefix), False  # cache
+            cache, exists = self.cache_labels(cache_path, prefix), False  # run cache ops
 
         # Display cache
         nf, nm, ne, nc, n = cache.pop('results')  # found, missing, empty, corrupt, total