fix WebKit caps in comments

less/carousel.less

@@ -75,7 +75,7 @@
   color: @carousel-control-color;
   text-align: center;
   text-shadow: @carousel-text-shadow;
-  // We can't have this transition here because webkit cancels the carousel
+  // We can't have this transition here because WebKit cancels the carousel
   // animation if you trip this while in the middle of another animation.
 
   // Set gradients for backgrounds

less/mixins.less

@@ -27,11 +27,11 @@
   }
 }
 
-// Webkit-style focus
+// WebKit-style focus
 .tab-focus() {
   // Default
   outline: thin dotted #333;
-  // Webkit
+  // WebKit
   outline: 5px auto -webkit-focus-ring-color;
   outline-offset: -2px;
 }

less/progress-bars.less

@@ -6,7 +6,7 @@
 // Bar animations
 // -------------------------
 
-// Webkit
+// WebKit
 @-webkit-keyframes progress-bar-stripes {
   from  { background-position: 40px 0; }
   to    { background-position: 0 0; }