* Clarify drag-n-drop behaviour again
Just found the real reason of drag-n-drop issue mentioned in
b89e8d16355bde7379f38de820bf350b4a4a0beb.
* Trying to formulate correctly
* Clarify the drag-n-drop behaviour
In my case I misunderstood it: I thought that I need to select the text and
drag the selection, because drag-n-drop did not work by default.
* Fix grammar
* House style:
** Spaces after the "!" of titles
** Blank line after titles
** Sentence Case for Heading Text
* Make use of wikitext-example-without-html macro for the examples
* Make use of .tip macro for tip
* Some phrasing improvements and clarifications
