Correct typo

src/content/chapter1_functions/lesson06_generic_functions/en.html

@@ -3,10 +3,11 @@
   arguments.
 </p>
 <p>
-  The <code>twice</code> function in the previous lesson only higher order
-  function only worked with functions that would take and return ints. This is
-  overly restrictive, it should be possible to use this function with any type,
-  so long as the function and the initial value are compatible.
+  The <code>twice</code> function in the previous lesson on
+  <i>higher order functions</i> only worked with functions that would take and
+  return ints. This is overly restrictive, it should be possible to use this
+  function with any type, so long as the function and the initial value are
+  compatible.
 </p>
 <p>
   To enable this Gleam support <em>generics</em>, also known as