Fix WKT form(s) of MULTIPOINT documentation

[mloskot]

Following the ​WKT form(s) of MULTIPOINT thread:

Apparently, there have been ​reasons to follow the incorrect examples presented in the OGC specs and use degenerate form of MULTIPOINT.

However, it may be worth to update the docs, especially section "4.1.1. OpenGIS WKB and WKT" and replace incorrect:

MULTIPOINT(0 0,1 2)

with

MULTIPOINT((0 0),(1 2))

[robe]

fixed for 2.1 at r12314 and trunk (2.2) at r12313

[mloskot]

Regina, thanks!