naga accepts wrong format name rg11b10float, should be rg11b10ufloat

Accoring to the spec, the correct name for the format is `rg11b10ufloat` https://www.w3.org/TR/WGSL/#texel-format-rg11b10ufloat
but naga currently only accepts the incorrect name `rg11b10float` when declaring the type for a storage texture.

I made a PR to fix it with a little more info #8219 