Grid Pattern: Fix typos (capitalization) (pull #2701)

* capitalization consistency: [-c][+C]ontrol + End
* lowercase Up ("one cell [-U][+u]p" x3)

content/patterns/grid/grid-pattern.html

@@ -95,7 +95,7 @@ <h3>Keyboard Interaction For Data Grids</h3>
               If focus is on the bottom cell in the column, focus does not move.
             </li>
             <li>
-              <kbd>Up Arrow</kbd>: Moves focus one cell Up.
+              <kbd>Up Arrow</kbd>: Moves focus one cell up.
               If focus is on the top cell in the column, focus does not move.
             </li>
             <li>
@@ -122,7 +122,7 @@ <h4>Note</h4>
                 While navigation keys, such as arrow keys, are moving focus from cell to cell, they are not available to do something like operate a combobox or move an editing caret inside of a cell.
                 If this functionality is needed, see <a href="#gridNav_inside">Editing and Navigating Inside a Cell</a>.
               </li>
-              <li>If navigation functions can dynamically add more rows or columns to the DOM, key events that move focus to the beginning or end of the grid, such as <kbd>control + End</kbd>, may move focus to the last row in the DOM rather than the last available row in the back-end data.</li>
+              <li>If navigation functions can dynamically add more rows or columns to the DOM, key events that move focus to the beginning or end of the grid, such as <kbd>Control + End</kbd>, may move focus to the last row in the DOM rather than the last available row in the back-end data.</li>
             </ul>
           </div>
           <p>If a grid supports selection of cells, rows, or columns, the following keys are commonly used for these functions.</p>
@@ -136,7 +136,7 @@ <h4>Note</h4>
             <li><kbd>Shift + Right Arrow</kbd>: Extends selection one cell to the right.</li>
             <li><kbd>Shift + Left Arrow</kbd>: Extends selection one cell to the left.</li>
             <li><kbd>Shift + Down Arrow</kbd>: Extends selection one cell down.</li>
-            <li><kbd>Shift + Up Arrow</kbd>: Extends selection one cell Up.</li>
+            <li><kbd>Shift + Up Arrow</kbd>: Extends selection one cell up.</li>
           </ul>
           <div class="note">
             <h5>Note</h5>
@@ -246,7 +246,7 @@ <h4>Note</h4>
             <li><kbd>Shift + Right Arrow</kbd>: Extends selection one cell to the right.</li>
             <li><kbd>Shift + Left Arrow</kbd>: Extends selection one cell to the left.</li>
             <li><kbd>Shift + Down Arrow</kbd>: Extends selection one cell down.</li>
-            <li><kbd>Shift + Up Arrow</kbd>: Extends selection one cell Up.</li>
+            <li><kbd>Shift + Up Arrow</kbd>: Extends selection one cell up.</li>
           </ul>
           <div class="note">
             <h4>Note</h4>