mention file extensions (#51)

Author: ChucklesOnGitHub

source/ucla-miniscope-v4/user/miniscope-daq/save-data/tutorial.rst

@@ -33,7 +33,7 @@ Workflow Tutorial
 
         ..  grid-item::
 
-            *   Left-click the ``VideoWriter`` node and edit fields under the properties pane. Confirm frame rate matches that of the UCLA Miniscope v4. 
+            *   Left-click the ``VideoWriter`` node and edit fields under the properties pane. Confirm frame rate matches that of the UCLA Miniscope v4. Make sure the file name has a valid extension (".avi").
 
             *   For ``FourCC``, "DIB " and "FMP4" are recommended for neural recordings. 
 
@@ -53,7 +53,7 @@ Workflow Tutorial
 
         ..  grid-item::
 
-            *   Left-click the ``CsvWriter`` node and edit fields under the properties pane
+            *   Left-click the ``CsvWriter`` node and edit fields under the properties pane. Make sure the file name has a valid extension (".csv").
 
         ..  grid-item::
 
@@ -78,4 +78,4 @@ Workflow Tutorial
 ..  [1]
     .. include::    /includes/start-workflow.rst
 
-..  [2] Stop a workflow by left-clicking the *Stop* button (indicated by dark red square) at the top of the Bonsai workflow editor or pressing ``Shift+F5`` while the Bonsai workflow editor is the active window.
+..  [2] Stop a workflow by left-clicking the *Stop* button (indicated by dark red square) at the top of the Bonsai workflow editor or pressing ``Shift+F5`` while the Bonsai workflow editor is the active window.