Fix formatting in Wallet section

* Added empty line between end of paragraphs and beginning of lists
  (required by markdown for deliniation)

* Changed mediawiki sub-list item (\*\*) to markdown sub-list item
  (\ \ \ \ \*)

* Escaped OR operator (\|\|) which were accidentally creating
  multimarkdown-style tables

* Added emply lines around each list item so the list item text is
  wrapped in paragraph tags. I think this makes long list items
  easier to read.

[I'll merge this formatting-only request in a few hours unless critical feedback is received.]