Make it more prominent in the wiki that set(...) is necessary to update property values

[zoechi]

set(...) is used in two array examples in the wiki, but nowhere else (at least I coudn't find it) is explicitly stated that one of these Polymer API methods needs to be used to get bindings updated. Some background why this is necessary would be nice (for example the difference to notify: true)

[dam0vm3nt]

or cite polymer_autonotify that will make the use of set and list accessors API no more necessary.

[zoechi]

+1 😃