update docs

Author: amsardesai

docs/rules/dynamic-import-chunkname.md

@@ -56,6 +56,13 @@ import(
   // webpackChunkName: "someModule"
   'someModule',
 );
+
+// chunk names are disallowed when eager mode is set
+import(
+  /* webpackMode: "eager" */
+  /* webpackChunkName: "someModule" */
+  'someModule',
+)
 ```
 
 ### valid
@@ -86,12 +93,6 @@ The following patterns are valid:
     /* webpackChunkName: 'someModule' */
     'someModule',
   );
-
-  // chunk name is optional when using eager mode
-  import(
-    /* webpackMode: "eager" */
-    'someModule',
-  );
 ```
 
 ### `allowEmpty: true`