ui/doc: change the cluster status icon from question to info

We want to keep the consistency of the icon.
since we already have quesion icon in the navbar, it should be better we use another icon.

ui/src/containers/ClusterMonitoring.js

@@ -89,7 +89,7 @@ const ClusterStatusValue = styled.span`
   }};
 `;
 
-const QuestionMarkIcon = styled.i`
+const InformationMarkIcon = styled.i`
   color: ${props => props.theme.brand.primary};
 `;
 
@@ -222,7 +222,7 @@ const ClusterMonitoring = props => {
               </TooltipContent>
             }
           >
-            <QuestionMarkIcon className="fas fa-question-circle" />
+            <InformationMarkIcon className="fas fa-info-circle" />
           </Tooltip>
           {clusterStatus.isLoading ? <LoaderCoreUI size="small" /> : null}
         </LeftClusterStatusContainer>