docs(user-head): 更新头像组件文档，优化描述信息，移除冗余字段

Author: afkdsghk211331

examples/sites/demos/apis/user-head.js

@@ -82,8 +82,8 @@ export default {
           type: 'string',
           defaultValue: '',
           desc: {
-            'zh-CN': '设置头像值。',
-            'en-US': 'Set the profile picture.'
+            'zh-CN': 'type=icon 时为图标类名，type=label时为字体串，type=image时为资源路径',
+            'en-US': 'If type is set to icon, it indicates the icon class name. If type is set to label, it indicates the font string. If type is set to image, it indicates the resource path'
           },
           mode: ['pc'],
           pcDemo: 'basic-usage'
@@ -124,19 +124,6 @@ export default {
           pcDemo: 'image-user-head',
           mfDemo: ''
         },
-        {
-          name: 'v-model',
-          type: 'string',
-          defaultValue: '',
-          desc: {
-            'zh-CN': 'type=icon 时为图标类名，type=label 时为字体串，type=image 时为资源路径',
-            'en-US':
-              'If type is set to icon, it indicates the icon class name. If type is set to label, it indicates the font string. If type is set to image, it indicates the resource path'
-          },
-          mode: ['pc', 'mobile-first'],
-          pcDemo: 'icon-user-head',
-          mfDemo: ''
-        },
         {
           name: 'value',
           type: 'string',