documentation/poky-ref-manual/ref-variables.xml: variable edits

* For PE/PV/PR/PN these pertain to a recipe ("package" was used here
  historically).
* References to variables should not be prefixed with $ in the text
* Add text about suffixing RCONFLICTS as per other package variables
* Make ALLOW_EMPTY example complete
* Clarify and add example for AUTOREV

In addition to Paul's patch, I re-worded two instances.  One
to get rid of "package(s)", which is poor form.  And a second
to get rid of "unstable/development", which is also poor form.

(From yocto-docs rev: 498349f8d82f46433626521d148ff6c1d72e2b1c)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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