Corrected 3.0 responsive utility class reference mapping when migrating from...

Corrected 3.0 responsive utility class reference mapping when migrating from 2.x (now accounting for new Large device support.) Also synchronized breakpoint values from Grid options > Media queries, for clarity.

getting-started.html

@@ -369,27 +369,27 @@ bootstrap/
           </tr>
           <tr>
             <td><code>.visible-phone</code></td>
-            <td><code>.visible-sm</code></td>
+            <td><code>.visible-xs</code></td>
           </tr>
           <tr>
             <td><code>.visible-tablet</code></td>
-            <td><code>.visible-md</code></td>
+            <td><code>.visible-sm</code></td>
           </tr>
           <tr>
             <td><code>.visible-desktop</code></td>
-            <td><code>.visible-lg</code></td>
+            <td><code>.visible-md</code></td>
           </tr>
           <tr>
             <td><code>.hidden-phone</code></td>
-            <td><code>.hidden-sm</code></td>
+            <td><code>.hidden-xs</code></td>
           </tr>
           <tr>
             <td><code>.hidden-tablet</code></td>
-            <td><code>.hidden-md</code></td>
+            <td><code>.hidden-sm</code></td>
           </tr>
           <tr>
             <td><code>.hidden-desktop</code></td>
-            <td><code>.hidden-lg</code></td>
+            <td><code>.hidden-md</code></td>
           </tr>
           <tr>
             <td><code>.input-small</code></td>
@@ -460,21 +460,25 @@ bootstrap/
             <td><code>.jumbotron</code></td>
           </tr>
           <tr>
-            <td>Tiny grid (&lt;768 px)</td>
+            <td>Tiny grid (&lt;768px)</td>
             <td><code>.col-xs-*</code></td>
           </tr>
           <tr>
-            <td>Small grid (&gt;768 px)</td>
+            <td>Small grid (&ge;768px)</td>
             <td><code>.col-sm-*</code></td>
           </tr>
           <tr>
-            <td>Medium grid (&gt;992 px)</td>
+            <td>Medium grid (&ge;992px)</td>
             <td><code>.col-md-*</code></td>
           </tr>
           <tr>
-            <td>Large grid (&gt;1200 px)</td>
+            <td>Large grid (&ge;1200px)</td>
             <td><code>.col-lg-*</code></td>
           </tr>
+          <tr>
+            <td>Responsive utility classes (&ge;1200px)</td>
+            <td><code>.visible-lg</code> <code>.hidden-lg</code></td>
+          </tr>
           <tr>
             <td>Offsets</td>
             <td><code>.col-sm-offset-*</code> <code>.col-md-offset-*</code> <code>.col-lg-offset-*</code></td>