types(NavBar): fix NavBarProps spelling (#9818)

packages/vant/src/nav-bar/NavBar.tsx

@@ -30,7 +30,7 @@ const navBarProps = {
   safeAreaInsetTop: Boolean,
 };
 
-export type NavbarProps = ExtractPropTypes<typeof navBarProps>;
+export type NavBarProps = ExtractPropTypes<typeof navBarProps>;
 
 export default defineComponent({
   name,

packages/vant/src/nav-bar/README.md

@@ -120,7 +120,7 @@ export default {
 The component exports the following type definitions:
 
 ```ts
-import type { NavbarProps } from 'vant';
+import type { NavBarProps } from 'vant';
 ```
 
 ## Theming

packages/vant/src/nav-bar/README.zh-CN.md

@@ -128,7 +128,7 @@ export default {
 组件导出以下类型定义：
 
 ```ts
-import type { NavbarProps } from 'vant';
+import type { NavBarProps } from 'vant';
 ```
 
 ## 主题定制

packages/vant/src/nav-bar/index.ts

@@ -3,4 +3,4 @@ import _NavBar from './NavBar';
 
 export const NavBar = withInstall(_NavBar);
 export default NavBar;
-export type { NavbarProps } from './NavBar';
+export type { NavBarProps } from './NavBar';