While investigating a fix for #2316 I discovered some generally unexpected behavior when attempting to get sqlc to generate slices of types in overrides for Go code gen. So I added a boolean "slice" property to the "go_type" property of the overrides object array, which behaves similarly to the "pointer" property.

This doesn't "fix" the above-referenced issue per se, but it does provide a more explicit way to tell sqlc how to achieve the desired result.

The docs I wrote may be wrong, so feel free to advise on any changes and I'll incorporate them.