DOC: extraction docstring update

Co-authored-by: Scott Lowe <[email protected]>

fissa/extraction.py

@@ -23,12 +23,20 @@
 
 
 class DataHandlerAbstract():
-    """Abstract class for data handling.
-
-    The main thing to keep consistent is that the input into getmean(), roise2mask(), and extracttraces() depend
-    on the output of the image2array and rois2mask.
-
-    See the below DataHandler() and DataHandlerPillow() classes for example usages.
+    """Abstract class for a data handler.
+
+    Note
+    ----
+    - The `data` input into :meth:`getmean`, :meth:`rois2masks`, and
+      :meth:`extracttraces` must be the same format as the output to
+      :meth:`image2array`.
+    - The `masks` input into :meth:`extracttraces` must be the same format
+      as the output of :meth:`rois2mask`.
+
+    See Also
+    --------
+    See :class:`DataHandlerTifffile` and :class:`DataHandlerPillow` for example
+    subclasses.
     """
     def __init__(self):
         pass