Comment on places where we can use useTableSort in the future

The logic copypasta'ed into these three tables is an older version of that which was just extracted into useTableSort. It's not possible to use hooks in a class component like these three, but we leave a note in these places reminding us to use useTableSort in case we convert them to functional components in the future.

browser/src/CopyNumberVariantPage/CNVPopulationsTable.tsx

@@ -89,18 +89,21 @@ type CNVPopulationsTableState = any
 type CNVPopulationsTableProps = OwnPopulationsTableProps & typeof CNVPopulationsTable.defaultProps
 
 export class CNVPopulationsTable extends Component<
-  CNVPopulationsTableProps & { variant: CopyNumberVariant},
+  CNVPopulationsTableProps & { variant: CopyNumberVariant },
   CNVPopulationsTableState
 > {
   static defaultProps = {
     columnLabels: {},
     initiallyExpandRows: false,
-    variant: {}
+    variant: {},
   }
 
-  constructor(props: CNVPopulationsTableProps ) {
+  constructor(props: CNVPopulationsTableProps) {
     super(props)
 
+    // If/when we change this to a functional component, we can replace the
+    // following sorting logic and some other associated code by employing
+    // useTableSort.
     this.state = {
       sortBy: 'sf',
       sortAscending: false,

browser/src/MitochondrialVariantPage/MitochondrialVariantHaplogroupFrequenciesTable.tsx

@@ -51,6 +51,9 @@ class MitochondrialVariantHaplogroupFrequenciesTable extends Component<Props, St
     sortAscending: false,
   }
 
+  // If/when we change this to a functional component, we can replace the
+  // following sorting logic and some other associated code by employing
+  // useTableSort.
   setSortBy(sortBy: any) {
     this.setState((state: any) => ({
       sortBy,

browser/src/VariantPage/PopulationsTable.tsx

@@ -117,6 +117,9 @@ export class PopulationsTable extends Component<PopulationsTableProps, Populatio
   constructor(props: PopulationsTableProps) {
     super(props)
 
+    // If/when we change this to a functional component, we can replace the
+    // following sorting logic and some other associated code by employing
+    // useTableSort.
     this.state = {
       sortBy: 'af',
       sortAscending: false,