Update go docs

[ncruces]

I'm guessing this version (from the CGO example) is more widely applicable (I ship a database/sql driver as well).

PS: if you find that all the copies and allocs are a bottleneck, I'm guessing an buf, err := sqlite_vec .AppendFloat32(buf, values), or even an API change (on my side) that allows serializing directly into "native" memory, would help.