fix some accidental extra newlines in docs

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

docs/features/software-catalog/catalog-customization.md

@@ -70,9 +70,7 @@ The columns you see in the `CatalogIndexPage` were selected to be a good startin
 Suppose we want to add a new User Email column to the `User` kind in the Catalog. We can do this by overriding the `columns` that we pass into the `CatalogIndexPage` component in our `App.tsx`. First, we need to match the entity kind that we want to override, and then define the columns to show:
 
 ```tsx title="packages/app/src/App.tsx"
-{
-  /* highlight-add-start */
-}
+{/* prettier-ignore */ /* highlight-add-start */}
 const myColumnsFunc: CatalogTableColumnsFunc = entityListContext => {
   if (entityListContext.filters.kind?.value === 'user') {
     return [
@@ -84,9 +82,7 @@ const myColumnsFunc: CatalogTableColumnsFunc = entityListContext => {
 
   return CatalogTable.defaultColumnsFunc(entityListContext);
 };
-{
-  /* highlight-add-end */
-}
+{/* prettier-ignore */ /* highlight-add-end */}
 ```
 
 Then, we can implement the `createUserEmailColumn` function and add it to the list of columns. `field` is used to access the data from the entity, while `render` lets us customize how we display the data:
@@ -391,13 +387,9 @@ export const EntitySecurityTierPicker = () => {
 Now we can add the component to `CatalogIndexPage`:
 
 ```tsx title="packages/app/src/App.tsx"
-{
-  /* highlight-add-start */
-}
+{/* prettier-ignore */ /* highlight-add-start */}
 import { DefaultFilters } from '@backstage/plugin-catalog-react';
-{
-  /* highlight-add-end */
-}
+{/* prettier-ignore */ /* highlight-add-end */}
 
 const routes = (
   <FlatRoutes>

docs/tutorials/react-router-stable-migration.md

@@ -181,13 +181,9 @@ It's crucial that you update to `RequirePermission` at the same time as you upda
 When migrating over to React Router v6 stable, you might also see browser console warnings for the `Navigate` component. This will need to be wrapped up in a `Route` component with the `Navigate` component in the `element` prop.
 
 ```tsx
-{
-  /* highlight-remove-next-line */
-}
+{/* prettier-ignore */ /* highlight-remove-next-line */}
 <Navigate key="/" to="catalog" />;
-{
-  /* highlight-add-next-line */
-}
+{/* prettier-ignore */ /* highlight-add-next-line */}
 <Route path="/" element={<Navigate to="catalog" />} />;
 ```