Link to relevant docs in keymap.cson file

dot-atom/keymap.cson

@@ -17,3 +17,7 @@
 #   '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