adjust error msg

Author: hiyuki

packages/webpack-plugin/lib/runtime/optionProcessor.js

@@ -109,7 +109,7 @@ registered in parent context!`)
 export function getComponent (component, extendOptions) {
   component = component.__esModule ? component.default : component
   if (!component) {
-    error('getComponent() expected component options as first argument, but got undefined.')
+    error('getComponent() expected component options as the first argument, but got undefined.')
     return null
   }
   // eslint-disable-next-line

packages/webpack-plugin/lib/runtime/optionProcessorReact.js

@@ -7,7 +7,7 @@ export function getComponent (component, extendOptions) {
   component = component.__esModule ? component.default : component
   if (!component) {
     error(
-      `getComponent expecting a function/class component ${extendOptions?.displayName ? `[${extendOptions.displayName}]` : ''} as first argument, but got undefined.`
+      `getComponent expecting function/class component ${extendOptions?.displayName ? `[${extendOptions.displayName}] ` : ''}as the first argument, but got undefined.`
     )
     return null
   }