Update instructions.md

Author: 0x3at

exercises/practice/resistor-color/.docs/instructions.md

@@ -31,9 +31,6 @@ The goal of this exercise is to create a way:
 - to look up the numerical value associated with a particular color band
 - to list the different band colors
 
-Mnemonics map the colors to the numbers, that, when stored as an array, happen to map to their index in the array:
-Better Be Right Or Your Great Big Values Go Wrong.
-
 More information on the color encoding of resistors can be found in the [Electronic color code Wikipedia article][e-color-code].
 
 [e-color-code]: https://en.wikipedia.org/wiki/Electronic_color_code