Change config types in docs to appropriate types in code

[fanatid]

Based on #2590 (comment) & #2590 (comment)

Gonna take it after #2493 (comment)

[fanatid]

Before done this, some questions after first review:

• f32 => float
• f64 => double
• i32 => int
• i64 => long
• u32 => uint
• u64 => ulong
• usize => ?

Or types in docs should be just changed to: f32 / f64 / i32 / i64 / u32 / u64 / usize?

[lukesteensen]

TOML only has integer and float, so it probably makes sense to stick with that terminology. We can add the concept of signed/unsigned since that's meaningful for us.

• f32 => float
• f64 => float
• i32 => int
• i64 => int
• u32 => uint
• u64 => uint
• usize => uint

It may even be nice in the future to decouple the TOML types from the Rust types a bit. For example, it's convenient to use -1 as a shortcut for usize::MAX. But for the time being, I think the above is fine.

[fanatid]

OK, I changed int to uint where type is not i32/i64.