Remove known issues that have been resolved from the Sway Book
Remove some known issues that have been resolved
* [#1663](https://github.com/FuelLabs/sway/issues/1663): Using an explicit `return` in all branches of an `if let` expression causes a compile error. The workaround is to use implicit returns instead.
-* [#1664](https://github.com/FuelLabs/sway/issues/1664): Binary and hex literals cannot be used for integer types (i.e. `u8`, `u16`, `u32`, `u64`). Only decimal literals can be used at the moment.
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-* [#1657](https://github.com/FuelLabs/sway/issues/1657): Accessing data members of a `struct` directly from a function call does not currently work. The same applies to `enum` types and arrays. The workaround is to store the result of the function call in a temporary variable and accessing the required elements from that variable instead.
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* [#1387](https://github.com/FuelLabs/sway/issues/1387): In order to use `unwrap()` from the `result` library, all symbols of `result` needs to be imported via `use::result::*;`.
-* [#996](https://github.com/FuelLabs/sway/issues/996): Constants defined via the `const` keyword can only have primitive types. That is, it is not possible to define a `ContractId` or an `Address` as `const` for example.
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* [#870](https://github.com/FuelLabs/sway/issues/870): All `impl` blocks need to be defined before any of the functions they define can be called.
## Missing Features
