Stop mentioning obsolete integer suffixes
`us` and `is` were replaced with `usize` and `isize` some time ago.
@@ -271,7 +271,7 @@ cases mentioned in [Number literals](#number-literals) below.
##### Suffixes
| Integer | Floating-point |
|---------|----------------|
-| `u8`, `i8`, `u16`, `i16`, `u32`, `i32`, `u64`, `i64`, `is` (`isize`), `us` (`usize`) | `f32`, `f64` |
+| `u8`, `i8`, `u16`, `i16`, `u32`, `i32`, `u64`, `i64`, `isize`, `usize` | `f32`, `f64` |
#### Character and string literals
