Update with new save methods.

Author: kpinnipa

docs/user/features.rst

@@ -4,8 +4,11 @@ Features
 Creation of a New Snippet
 -------------------------
 
--  Right click and save highlighted code (lines of code)
--  Drag cell into panel to save (lines of code)
+-  Highlight code and right click to save as code snippet
+-  Right click cell and save all code within cell as code snippet
+-  Select multiple cells and right click to merge code across cells and save as one code snippet
+-  Select one or more cells and use keyboard shortcut (ctrl-shift-A or cmd-shift-A) to save as code snippet
+-  Drag cell into snippets panel to save as code snippet
 .. image:: ../../Design/add_snippet.png
 
 -  Plus button to create a new snippet from scratch