Format all instructions.append.md to start with an H1 (required but ignored) and H2

exercises/practice/anagram/.docs/instructions.append.md

@@ -1,3 +1,5 @@
 # Instructions Append
 
+## Implementation
+
 The anagrams can be returned in any order.

exercises/practice/list-ops/.docs/instructions.append.md

@@ -1,5 +1,7 @@
 # Instructions append
 
+## Implementation
+
 Using core language features to build and deconstruct arrays via destructuring, and using the array literal `[]` are allowed, but no functions from the `Array.prototype` should be used.
 
 In order to be able to test your solution, ensure `forEach` is implemented.

exercises/practice/queen-attack/.docs/instructions.append.md

@@ -1,9 +1,13 @@
 # Instructions append
 
+## Implementation
+
 A queen must be placed on a valid position on the board.
 Two queens cannot share the same position.
 
-If a position has not been given, the queens are at their [default starting positions](https://en.wikipedia.org/wiki/Rules_of_chess#Initial_setup). That's the bottom row (1) for the white queen and the top row (8) for the black queen. Both queens start in the fourth column (d).
+If a position has not been given, the queens are at their [default starting positions](https://en.wikipedia.org/wiki/Rules_of_chess#Initial_setup).
+That's the bottom row (1) for the white queen and the top row (8) for the black queen.
+Both queens start in the fourth column (d).
 
 ```text
   a b c d e f g h