Merge pull request #438 from oguzutku1745/update-operators-shl

Update shl

Author: d0cd

documentation/leo/04_operators.md

@@ -1043,7 +1043,7 @@ let b: u8 = a.shl(1u8); // 4u8
 
 #### Description
 
-Shifts `first` left by `second` bits, storing the result in `destination`.
+Shifts `first` left by `second` bits, storing the result in `destination`. The operation halts if the shift distance exceeds the bit size of `first`, or if the shifted result does not fit within the type of `first`.
 
 #### Supported Types