Adjusted parser.add_argument help sections according to previous edits

Author: gabridele

cubids/cli.py

@@ -443,8 +443,8 @@ def _parse_copy_exemplars():
         type=PathExists,
         action="store",
         help=(
-            "absolute path to the root of a BIDS dataset "
-            "containing one subject from each Acquisition Group. "
+            "name of the directory to create where to store exemplar dataset. "
+            "It will include one subject from each Acquisition Group. "
             "It should contain sub-X directories and "
             "dataset_description.json."
         ),
@@ -454,9 +454,12 @@ def _parse_copy_exemplars():
         type=IsFile,
         action="store",
         help=(
-            "absolute path to the .tsv file that lists one "
+            "path to the .tsv that lists one "
             "subject from each Acquisition Group "
-            "(*_AcqGrouping.tsv from the cubids-group output)"
+            "(*_AcqGrouping.tsv from the cubids-group output). "
+            "If the file is located in the code/CuBIDS "
+            "directory, then users can just pass the .tsv "
+            "filename instead of the full path "
         ),
     )
     parser.add_argument(