Fix 2 typos

less/scaffolding.less

@@ -27,7 +27,7 @@ body {
   background-color: @body-bg;
 }
 
-// Reset fonts for revelant elements
+// Reset fonts for relevant elements
 input,
 button,
 select,
@@ -60,7 +60,7 @@ a:focus {
 
 img {
   // Responsive images (ensure images don't scale beyond their parents)
-  max-width: 100%; // Part 1: Set a maxium relative to the parent
+  max-width: 100%; // Part 1: Set a maximum relative to the parent
   height: auto; // Part 2: Scale the height according to the width, otherwise you get stretching
 
   // Match vertical alignment with other comment elements