Adding note for update to v18 of react

src/App.js

@@ -146,7 +146,7 @@ function GetRestUrl (props) {
   const [restURL] = useQueryParam('restURL', StringParam)
   // console.log('restURL: ', restURL)
 
-  if(restURL) {
+  if (restURL) {
     serverUrl = restURL
     queryParamExists = true
   }

src/components/placeholder2.js

@@ -15,7 +15,7 @@ class Placeholder2 extends React.Component {
   render () {
     return (
       <>
-        <p style={{padding: '25px'}}>This is placeholder View #2</p>
+        <p style={{ padding: '25px' }}>This is placeholder View #2</p>
       </>
     )
   }

src/components/placeholder3.js

@@ -15,7 +15,7 @@ class Placeholder3 extends React.Component {
   render () {
     return (
       <>
-        <p style={{padding: '25px'}}>This is placeholder View #3</p>
+        <p style={{ padding: '25px' }}>This is placeholder View #3</p>
       </>
     )
   }

src/components/servers/index.js

@@ -59,7 +59,7 @@ class ServerSelect extends React.Component {
               Having trouble loading? Try selecting a different back-end server.
             </h5>
             <Form.Select onChange={(values) => this.selectServer(values)}>
-              <option>{this.props.queryParamExists ? (`${this.props.displayUrl}`) : (`Choose a back-end server`)}</option>
+              <option>{this.props.queryParamExists ? (`${this.props.displayUrl}`) : ('Choose a back-end server')}</option>
               {items}
             </Form.Select>
             <br />

src/index.js

@@ -13,3 +13,6 @@ ReactDOM.render(
     </QueryParamProvider>
   </>
   , document.getElementById('root'))
+
+// Updating to React v18
+// https://reactjs.org/blog/2022/03/08/react-18-upgrade-guide.html#updates-to-client-rendering-apis