misc updates to docs and form bug fix

lib/forms.less

@@ -79,6 +79,13 @@ form {
     border-color: #ccc;
     .box-shadow(inset 0 1px 2px rgba(0,0,0,.075));
   }
+  // Placeholder text gets special styles; can't be bundled together though for some reason
+  :-moz-placeholder {
+    color: @grayLight;
+  }
+  ::-webkit-input-placeholder {
+    color: @grayLight;
+  }
   // Focus states
   input[type=text],
   input[type=password],
@@ -229,7 +236,7 @@ div.input-append {
     height: 18px;
     text-align: center;
     text-shadow: 0 1px 0 #fff;
-    border: 1px solid #bbb;
+    border: 1px solid #ccc;
     border-right-width: 0;
     .border-radius(3px 0 0 3px);
   }