Generic impls missing from forc-doc

[sdankel]

@bitzoic wrote:

There seems to be a lot of inline documentation missing from the std-lib docs. For example, in StorageBytes only the Abi encode and decode implementations are shown:
https://fuellabs.github.io/sway/master/std/storage/storage_bytes/struct.StorageBytes.html

sway/sway-lib-std/src/storage/storage_bytes.sw

Line 11 in 7aa59f9

impl StorableSlice<Bytes> for StorageKey<StorageBytes> {

Or Vec, which doesn't show any implementations:
https://fuellabs.github.io/sway/master/std/vec/struct.Vec.html#

sway/sway-lib-std/src/vec.sw

Line 149 in 7aa59f9

impl<T> Vec<T> {

(edited)