fix: Formatting for Zig Zag Matrix challenge (#35403)

* fix: Formatting for Zig Zag Matrix challenge

* Remove non-breaking spaces and replace them with normal spaces

* Update zig-zag-matrix.english.md

* Move instructions to instructions section from description

* Update zig-zag-matrix.english.md

curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zig-zag-matrix.english.md

@@ -6,11 +6,9 @@ challengeType: 5
 
 ## Description
 <section id='description'>
-A &nbsp; ''zig-zag'' &nbsp; array is a square arrangement of the first &nbsp;
-$N^2$ &nbsp; integers, &nbsp; where the
-numbers increase sequentially as you zig-zag along the array's &nbsp;
-<a href="https://en.wiktionary.org/wiki/antidiagonal">anti-diagonals</a>.
-For example, given &nbsp; '''5''', &nbsp; produce this array:
+A 'zig-zag' array is a square arrangement of the first $N^2$ integers, where the numbers increase sequentially as you zig-zag along the array's <a href="https://en.wiktionary.org/wiki/antidiagonal">anti-diagonals</a>.
+
+For example, for the input <code>5</code>, the following result should be produced:
 <pre>
  0  1  5  6 14
  2  4  7 13 15
@@ -18,13 +16,11 @@ For example, given &nbsp; '''5''', &nbsp; produce this array:
  9 11 17 20 22
 10 18 19 23 24
 </pre>
-Write a function that takes the size of the zig-zag matrix, and returns the
-corresponding matrix as two-dimensional array.
 </section>
 
 ## Instructions
 <section id='instructions'>
-
+Write a function that takes the size of the zig-zag matrix, and returns the corresponding matrix as two-dimensional array.
 </section>
 
 ## Tests
@@ -33,17 +29,17 @@ corresponding matrix as two-dimensional array.
 ```yml
 tests:
   - text: ZigZagMatrix must be a function
-    testString: assert.equal(typeof ZigZagMatrix, 'function', 'ZigZagMatrix must be a function');
+    testString: assert.equal(typeof ZigZagMatrix, 'function');
   - text: ZigZagMatrix should return array
-    testString: assert.equal(typeof ZigZagMatrix(1), 'object', 'ZigZagMatrix should return array');
-  - text: ZigZagMatrix should return an array of nestes arrays
-    testString: assert.equal(typeof ZigZagMatrix(1)[0], 'object', 'ZigZagMatrix should return an array of nestes arrays');
+    testString: assert.equal(typeof ZigZagMatrix(1), 'object');
+  - text: ZigZagMatrix should return an array of nested arrays
+    testString: assert.equal(typeof ZigZagMatrix(1)[0], 'object');
   - text: ZigZagMatrix(1) should return [[0]]
-    testString: assert.deepEqual(ZigZagMatrix(1), zm1, 'ZigZagMatrix(1) should return [[0]]');
+    testString: assert.deepEqual(ZigZagMatrix(1), zm1);
   - text: ZigZagMatrix(2) should return [[0, 1], [2, 3]]
-    testString: assert.deepEqual(ZigZagMatrix(2), zm2, 'ZigZagMatrix(2) should return [[0, 1], [2, 3]]');
+    testString: assert.deepEqual(ZigZagMatrix(2), zm2);
   - text: ZigZagMatrix(5) must return specified matrix
-    testString: assert.deepEqual(ZigZagMatrix(5), zm5, 'ZigZagMatrix(5) must return specified matrix');
+    testString: assert.deepEqual(ZigZagMatrix(5), zm5);
 
 ```