Clarify instructions on AEM Chrome Plugin feature page

[davidjgonzalez]

Via gabriel w.

I’d recommend to add a hint somewhere (e.g. at the bottom of the plugin’s options screen) saying that the user should look at the AEM tab of the developer tools, or a link that opens the developer tools with that tab being activated.

Also some feedback about the warning shown on the options when the bundle isn’t installed yet (see attached image):

• The download button should say that it is the “jar” format that is needed to be downloaded.
• The install button doesn’t seem to work for me (it just shows a blank page).
• There should be a note that the user should go to HOST/system/console/bundles, click install, pick the jar file, and once done start it.