Clarified instructions for Pairwise algorithm (#17013)

* Clarified instructions for Pairwise algorithm

Added an example to further clarify the directions in the "Pairwise" algorithm, per issue #16800 https://github.com/freeCodeCamp/freeCodeCamp/issues/16800

* Change "for example" to "for instance"

challenges/08-coding-interview-questions-and-take-home-assignments/coding-interview-algorithm-questions.json

@@ -209,7 +209,7 @@
       "title": "Pairwise",
       "description": [
         "Given an array <code>arr</code>, find element pairs whose sum equal the second argument <code>arg</code> and return the sum of their indices.",
-        "You may use multiple pairs that have the same numeric elements but different indices. Each pair should use the lowest possible available indices. Once an element has been used it cannot be reused to pair with another element.",
+        "You may use multiple pairs that have the same numeric elements but different indices. Each pair should use the lowest possible available indices. Once an element has been used it cannot be reused to pair with another element. For instance, <code>pairwise([1, 1, 2], 3)</code> creates a pair <code>[2, 1]</code> using the 1 at indice 0 rather than the 1 at indice 1, because 0+2 < 1+2.",
         "For example <code>pairwise([7, 9, 11, 13, 15], 20)</code> returns <code>6</code>. The pairs that sum to 20 are <code>[7, 13]</code> and <code>[9, 11]</code>. We can then write out the array with their indices and values.",
         "<table class=\"table\"><tr><th><strong>Index</strong></th><th>0</th><th>1</th><th>2</th><th>3</th><th>4</th></tr><tr><td>Value</td><td>7</td><td>9</td><td>11</td><td>13</td><td>15</td></tr></table>",
         "Below we'll take their corresponding indices and add them.",