Acronyms, titles, markdown and grammar improved.

changed first header from question to title, likewise What are native apps; removed possessive apostrophe from "Digital Leaders meeting" as it's an attributive noun; API spelt out and put in markdown; removed 'so-called' modifier from 'apps'; linked to HTML5 explanation; removed PM's dashboard as it had no link unlike the other 3 examples; changed 3rd party to third party for consistency with other documents; full stops after each point in the numbered list.