Renamed the Sparklines button to Sparkline

Web/OfficeWeb/apps/spreadsheeteditor/main/resources/help/en/UsageInstructions/InsertSparklines.htm

@@ -23,7 +23,7 @@
                 <li><b>Win/Loss</b> is suitable for representing data that include both positive and negative values.</li>
             </ul>
             <h3>Insert Sparklines</h3>
-            <p>To insert a <b>Sparkline</b> chart, select the data range to include in the sparkline, or click a blank cell where to place it, go to the <b>Insert</b> tab and click the <b>Sparklines</b> <img alt="Sparklines Button" src="../images/sparklines_button.png" /> button on the top toolbar. Choose a sparkline that serves your purpose. The <b>Create Sparklines</b> window will open, click the <b>Select data</b> icon to specify the data range, and the location of the sparkline, click <b>OK</b> to confirm</p>
+            <p>To insert a <b>Sparkline</b> chart, select the data range to include in the sparkline, or click a blank cell where to place it, go to the <b>Insert</b> tab and click the <b>Sparkline</b> <img alt="Sparkline Button" src="../images/sparklines_button.png" /> button on the top toolbar. Choose a sparkline that serves your purpose. The <b>Create Sparklines</b> window will open, click the <b>Select data</b> icon to specify the data range, and the location of the sparkline, click <b>OK</b> to confirm</p>
 			<p><img alt="Create Sparkline Window" src="../images/createsparkline_window.png" /></p>
             <h3>Edit and Format Sparklines</h3>
             <p>After inserting a sparkline, you can customize and edit it. Click the cell with a sparkline to enable the <b>Sparkline settings</b> tab on the right sidebar.</p>