doc: remove alternate keyset create scenario
- **Precondition:** -
- **Main success scenario:**
- Caller requests to create a new `KeySet`
- - Core instantiates an emtpy `KeySet` and returns it
-- **Alternative scenario:**
- - Caller requests to create a new `KeySet`, with known content
- - Core instantiates an appropriately sized `KeySet`, fills it and returns it
+ - Core instantiates an empty `KeySet` and returns it
+- **Alternative scenario:** -
- **Error scenario:** -
- **Postcondition:**
- `KeySet` exists and is usable by Caller
- - `KeySet` optionally has initial contents defined by Caller
- **Non-functional Constraints:**
- `KeySet` MUST be resizable after creation
- `KeySet` SHOULD be efficient for small and larger sizes
