pgsql: Clarify type resolution behavior for domain types.

Clarify type resolution behavior for domain types.

The user documentation was vague and not entirely accurate about how
we treat domain inputs for ambiguous operators/functions. Clarify
that, and add an example and some commentary. Per a recent question
from Adam Mackler.

It's acted like this ever since we added domains, so back-patch
to all supported branches.

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/d4b13fab4e009c52567283b4b42b190c4696c355

Modified Files
--------------
doc/src/sgml/typeconv.sgml | 102 ++++++++++++++++++++++++++++++++++++++------
1 file changed, 89 insertions(+), 13 deletions(-)

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