op_exp : explanation + example for bit-wise

I think adding explanation + example for the bit-wise AND, OR and XOR could make it easier to understand them.
The bit-wise invert has a link for more details. I left it as it is.

Author: mattduerrmeier

op_exp.md

@@ -61,16 +61,16 @@ Here is a quick overview of the available operators:
     - `11` is represented in bits by `1011` which when right shifted by 1 bit gives `101`which is the decimal `5`.
 
 - `&` (bit-wise AND)
-    - Bit-wise AND of the numbers
-    - `5 & 3` gives `1`.
-
+    - Bit-wise AND of the numbers: if both bits are `1`, the result is `1`. Else it's `0`.
+    - `5 & 3` gives `1` (`0101 & 0011` gives `0001`)
+    
 - `|` (bit-wise OR)
-    - Bitwise OR of the numbers
-    - `5 | 3` gives `7`
-
-- `^` (bit-wise XOR)
-    - Bitwise XOR of the numbers
-    - `5 ^ 3` gives `6`
+    - Bitwise OR of the numbers: if both bits are `0`, the result is `0`. Else it's `1`. 
+    - `5 | 3` gives `7` (`0101 | 0011` gives `0111`)
+    
+- `^` (bit-wise XOR) 
+    - Bitwise XOR of the numbers: if both bits (`1 or 0`) are the the same, the result is `0`. Else it's `1`.
+    - `5 ^ 3` gives `6` (`O101 ^ 0011` gives `0110`)
 
 - `~` (bit-wise invert)
     - The bit-wise inversion of x is -(x+1)