[OpenLayers-Dev] Fix bug on spherical mercator wikipage

[Andrés Maneiro]

Hello devs,

the sphericalmercator projection wikipage [1] has a minor bug on 6th 
paragraph: «Spherical Mercator has an official designation of 
EPSG:3785.», when it should say EPSG:3857, as the later paragraphs on 
that wikipage states.

Don't know how I'm supposed to report this, so I'd rather write here.

[1] http://docs.openlayers.org/library/spherical_mercator.html

best,
amaneiro