Update index.html

create table t (ts timestamp, speed int); // fix 'cdata' to 'speed'

documentation/tdenginedocs-en/getting-started/index.html

@@ -28,7 +28,7 @@
 <p>In the TDengine shell, you can create databases, create tables and insert/query data with SQL. Each query command ends with a semicolon. It works like MySQL, for example:</p>
 <pre><code class="mysql language-mysql">create database db;
 use db;
-create table t (ts timestamp, cdata int);
+create table t (ts timestamp, speed int);
 insert into t values ('2019-07-15 10:00:00', 10);
 insert into t values ('2019-07-15 10:01:05', 20);
 select * from t;