Tree Pattern and Examples: Clarify Home Key Description

For issues #223, #224, #225, and #226, modified the keyboard table of the tree view example pages and the keyboard section of the tree view design pattern.
For the description of the Home key, per suggestion from @annabbott and @MichielBijl, added the phrase "without opening or closing a node".

aria-practices.html

@@ -2082,7 +2082,7 @@ <h4>Keyboard Interaction</h4>
            </li>
           <li><kbd>Down Arrow</kbd>: Moves focus to the next node that is focusable without opening or closing a node.</li>
           <li><kbd>Up Arrow</kbd>: Moves focus to the previous node that is focusable without opening or closing a node.</li>
-          <li><kbd>Home</kbd>: Moves focus to the first node in the tree.</li>
+          <li><kbd>Home</kbd>: Moves focus to the first node in the tree without opening or closing a node.</li>
           <li><kbd>End</kbd>: Moves focus to the last node in the tree that is focusable without opening a node.</li>
           <li><kbd>Enter</kbd>: activates a node, i.e., performs its default action. For parent nodes, one possible default action is to open or close the node. In single-select trees where selection does not follow focus (see note below), the default action is typically to select the focused node.</li>
           <li>Type-ahead is recommended for all trees, especially for trees with more than 7 root nodes:

examples/treeview/treeview-1/treeview-1a.html

@@ -340,7 +340,7 @@ <h2 id="kbd_label">Keyboard Support</h2>
             </tr>
             <tr>
               <th><kbd>Home</kbd></th>
-              <td>Moves focus to first node.</td>
+              <td>Moves focus to first node without opening or closing a node.</td>
             </tr>
             <tr>
               <th><kbd>End</kbd></th>

examples/treeview/treeview-1/treeview-1b.html

@@ -500,7 +500,7 @@ <h2 id="kbd_label">Keyboard Support</h2>
             </tr>
             <tr>
               <th><kbd>Home</kbd></th>
-              <td>Moves focus to first node.</td>
+              <td>Moves focus to first node without opening or closing a node.</td>
             </tr>
             <tr>
               <th><kbd>End</kbd></th>

examples/treeview/treeview-2/treeview-2a.html

@@ -417,7 +417,7 @@ <h2 id="kbd_label">Keyboard Support</h2>
             </tr>
             <tr>
               <th><kbd>Home</kbd></th>
-              <td>Moves focus to first node.</td>
+              <td>Moves focus to first node without opening or closing a node.</td>
             </tr>
             <tr>
               <th><kbd>End</kbd></th>

examples/treeview/treeview-2/treeview-2b.html

@@ -549,7 +549,7 @@ <h2 id="kbd_label">Keyboard Support</h2>
             </tr>
             <tr>
               <th><kbd>Home</kbd></th>
-              <td>Moves focus to first node.</td>
+              <td>Moves focus to first node without opening or closing a node.</td>
             </tr>
             <tr>
               <th><kbd>End</kbd></th>