修改webview大小写的问题；以及增加keywords关键词

Author: dcloud-wandl

index.html

@@ -6,7 +6,7 @@
 		<title>HBuilderX插件开发指南</title>
 		<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
 		<meta name="description" content="HBuilderX：极客开发工具">
-		<meta name="keywords" content="HBuilderX HBuilder 插件开发指南">
+		<meta name="keywords" content="DCloud,数字天堂,数字天堂网络,数字天堂（北京）网络技术有限公司,HBuilder,HX,HBX,HBuilderX插件开发指南,插件开发,插件,插件市场,插件开发指南,插件API,HBuilderX API,Extension API">
 		<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
 		<link rel="shortcut icon" type="image/x-icon" href="//hx.dcloud.net.cn/static/favicon/favicon.png">
 		<link rel="stylesheet" href="/static/vue.css">

views.md

@@ -155,7 +155,7 @@ const hx = require('hbuilderx');
  * @description 显示webview
  */
 function showWebView(webviewPanel) {
-    let webview = webviewPanel.WebView;
+    let webview = webviewPanel.webView;
 
     var background = '';