Cleaned up some variable names

src/HeaderTagInterpreter.php

@@ -27,6 +27,6 @@ trait HeaderTagInterpreter
         $desired = range((int) $topLevel, (int) $topLevel + ((int) $depth - 1));
         $allowed = [1, 2, 3, 4, 5, 6];
 
-        return array_map(function($v) { return 'h'.$v; }, array_intersect($desired, $allowed));
+        return array_map(function($val) { return 'h'.$val; }, array_intersect($desired, $allowed));
     }
 }

src/UniqueSluggifier.php

@@ -52,11 +52,11 @@ class UniqueSluggifier
     {
         $slugged = $this->slugify->slugify($text);
 
-        $ct = 1;
+        $count = 1;
         $orig = $slugged;
         while (in_array($slugged, $this->used)) {
-            $slugged = $orig . '-' . $ct;
+            $slugged = $orig . '-' . $count;
-            $ct++;
+            $count++;
         }
 
         $this->used[] = $slugged;