message: Updated the customization.md
diff: @@ -18,11 +18,12 @@ customizable elements. For example
  ```typescript jsx
  const plugin = createPlugin({
  id: 'my-plugin',
  - configure(options?: PluginInputOptions): PluginOptions {
  - const defaultOptions = { createButtonTitle: 'Create' };
  - if (!options) {
  - return defaultOptions;
  - }
  + __experimentalConfigure(
  + options?: CatalogInputPluginOptions,
  + ): CatalogPluginOptions {
  + const defaultOptions = {
  + createButtonTitle: 'Create',
  + };
  return { ...defaultOptions, ...options };
  },
  });
  @@ -31,12 +32,19 @@ const plugin = createPlugin({
  And the rendering part of the exposed component can retrieve that metadata as:
  ```typescript jsx
  -export type CatalogPageOptionsProps = {
  +export type CatalogPluginOptions = {
  + createButtonTitle: string;
  +};
  +
  +export type CatalogInputPluginOptions = {
  createButtonTitle: string;
  };
  +export const useCatalogPluginOptions = () =>
  + usePluginOptions<CatalogPluginOptions>();
  +
  export function DefaultMyPluginWelcomePage() {
  - const { createButtonTitle } = usePluginOptions<CatalogPageOptionsProps>();
  + const { createButtonTitle } = useCatalogPluginOptions();
  return (
  <div>
  @@ -54,7 +62,7 @@ plugin. Example:
  ```typescript jsx
  import { myPlugin } from '@backstage/my-plugin';
  -myPlugin.reconfigure({
  - createButtonTitle: 'Maybe Create',
  +myPlugin.__experimentalReconfigure({
  + createButtonTitle: 'New',
  });
  ```
  