Docs: minor typos correction demos/grids/grid-custom.html
Docs: minor typos correction demos/grids/grid-custom.html

a bit unsure whether that or then was meant here. I think that is better, but unsure about the comma
hinaloe/jqm-demo-ja,arschmitz/uglymongrel-jquery-mobile,startxfr/jquery-mobile,hinaloe/jqm-demo-ja,arschmitz/jquery-mobile,arschmitz/jquery-mobile,startxfr/jquery-mobile,arschmitz/uglymongrel-jquery-mobile,hinaloe/jqm-demo-ja,startxfr/jquery-mobile,arschmitz/uglymongrel-jquery-mobile,arschmitz/jquery-mobile