Wrong install command in webcomponents page

[zamuset]

Description

Just a quick FYI for newbies like myself, the install command is wrong in the webcomponents page and it throws an error when you try to install it

Expected command

bower install --save PolymerElements/paper-button

Actual command

npm install --save PolymerElements/paper-button

[keanulee]

For 2.x (current stable) versions it's still bower, but for the upcoming 3.x version it should be npm i @polymer/paper-button.