Fix minor typo in tooltip

public/app/plugins/datasource/elasticsearch/partials/bucket_agg.html

@@ -66,7 +66,7 @@
 					<input class="tight-form-input" type="number" ng-model="agg.settings.trimEdges" ng-change="onChangeInternal()">
 					<input class="tight-form-input" type="number" ng-model="agg.settings.trimEdges" ng-change="onChangeInternal()">
 				</li>
 				</li>
 				<li class="tight-form-item last">
 				<li class="tight-form-item last">
-					<i class="fa fa-question-circle" bs-tooltip="'Trim the edges on the timeserie x datapoints'" data-placement="right"></i>
+					<i class="fa fa-question-circle" bs-tooltip="'Trim the edges on the timeseries x datapoints'" data-placement="right"></i>
 				</li>
 				</li>
 			</ul>
 			</ul>
 			<div class="clearfix"></div>
 			<div class="clearfix"></div>