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
 
+## Track specific instructions
+
 You must return the anagrams in the same order as they are listed in the candidate words.

exercises/practice/complex-numbers/.docs/instructions.append.md

@@ -1,4 +1,6 @@
-# Append
+# Instructions append
+
+## Track specific instructions
 
 You will have to implement your own equality operator for the `ComplexNumber` object.
 This will pose the challenge of comparing two floating point numbers.

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

@@ -1,3 +1,5 @@
-## Item representation
+# Instructions append
 
-The items are represented by the `Item` struct in `Item.swift`.
+## Track specific instructions
+
+The items are represented by the `Item` struct in `Item.swift`.

exercises/practice/roman-numerals/.docs/instructions.append.md

@@ -1,4 +1,6 @@
-## Adding method to the Int structure
+# Instructions append
+
+## Track specific instructions
 
 This exercise focuses on adding methods to the `Int` structure in Swift.
 This is easiest done through using [extensions][extensions].

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

@@ -1,4 +1,6 @@
-## Adding method to the Array structure
+# Instructions append
+
+## Track specific instructions
 
 This exercise focuses on adding methods to the `Array` structure in Swift.
 This is easiest done through using [extensions][extensions].