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
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/6aa61580e08d58909b2a8845a4087b7699335ee0

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

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