[docs] remove ErrorList from FormProps docs, fix bad theme imports (r…

…jsf-team#3770)

* Fix rjsf-team#3758 by removing `ErrorList` from docs, which should have been removed when v5 was released

* Fix rjsf-team#3670 - fix bad theme imports in docs

---------

Co-authored-by: Heath C <51679588+heath-freenome@users.noreply.github.com>

packages/docs/docs/api-reference/form-props.md

@@ -163,10 +163,6 @@ The value of this prop will be passed to the `enctype` [HTML attribute on the fo
 
 This prop allows passing in custom errors that are augmented with the existing JSON Schema errors on the form; it can be used to implement asynchronous validation. See [Validation](../usage/validation.md) for more information.
 
-## ErrorList
-
-You can pass a React component to this prop to customize how form errors are displayed. See [Validation](../usage/validation.md) for more information.
-
 ## fields
 
 Dictionary of registered fields in the form. See [Custom Widgets and Fields](../advanced-customization/custom-widgets-fields.md) for more information.

packages/docs/docs/migration-guides/v5.x upgrade guide.md

@@ -542,7 +542,7 @@ or
 
 ```tsx
 import { withTheme } from '@rjsf/core';
-import Theme from '@rjsf/material-ui/v5';
+import { Theme } from '@rjsf/material-ui/v5';
 // Make modifications to the theme with your own fields and widgets
 const Form = withTheme(Theme);
 ```
@@ -551,7 +551,7 @@ or
 
 ```tsx
 import { withTheme } from '@rjsf/core';
-import Theme5 from '@rjsf/material-ui';
+import { Theme as Theme5 } from '@rjsf/material-ui';
 // Make modifications to the theme with your own fields and widgets
 const Form = withTheme(Theme5);
 ```
@@ -566,7 +566,7 @@ or
 
 ```tsx
 import { withTheme } from '@rjsf/core';
-import Theme from '@rjsf/mui';
+import { Theme } from '@rjsf/mui';
 // Make modifications to the theme with your own fields and widgets
 const Form = withTheme(Theme);
 ```