Use shift in the example rather than explaining the difference

dot-atom/keymap.cson

@@ -13,11 +13,9 @@
 #   'enter': 'editor:newline'
 #
 # '.workspace':
-#   'ctrl-P': 'core:move-up'
+#   'ctrl-shift-p': 'core:move-up'
 #   'ctrl-p': 'core:move-down'
 #
-# In the example above, 'ctrl-P' is equivalent to 'ctrl-shift-p'.
-#
 # You can find more information about keymaps in these guides:
 # * https://atom.io/docs/latest/customizing-atom#customizing-key-bindings
 # * https://atom.io/docs/latest/advanced/keymaps