add info-icon for Per Capita Search (#2481)

src/pages/Dashboard/Analysis.js

@@ -560,10 +560,22 @@ class Analysis extends Component {
                 <Col sm={12} xs={24} style={{ marginBottom: 24 }}>
                   <NumberInfo
                     subTitle={
+                      <span>
                         <FormattedMessage
                           id="app.analysis.per-capita-search"
                           defaultMessage="Per Capita Search"
                         />
+                        <Tooltip
+                          title={
+                            <FormattedMessage
+                              id="app.analysis.introduce"
+                              defaultMessage="introduce"
+                            />
+                          }
+                        >
+                          <Icon style={{ marginLeft: 8 }} type="info-circle-o" />
+                        </Tooltip>
+                      </span>
                     }
                     total={2.7}
                     status="down"