doc: Clean up roff source in manpage

* The header's comments were written incorrectly. A comment line in Roff
  starts with a .\" sequence, whereas .\ is attempting to call a command
  whose name starts with a space. Because Roff interpreters will discard
  unrecognised control lines, the malformed "comments" were just noops.

* Repeating font macros have been used to format the synopsis instead of
  escape sequences (\fB…\fR). This makes for admittedly more sustainable
  source code for an editor who lacks knowledge of Roff.

* A basic macro has been added to insert highlighted URLs with less line
  noise. To insert a bold and underlined URL on a new line, one only has
  to write ".ur http://…"

PR-URL: https://github.com/nodejs/node/pull/7819
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

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