Add description of table format.

CONTRIBUTING_DOC.md

@@ -79,7 +79,7 @@ The procedure for submitting the modification is the same as that for submitting
 
   ```
 
-- A blank line must be added before and after an image and an image title. Otherwise, the typesetting will be abnormal.
+- A blank line must be added before and after an image and an image title. Otherwise, the typesetting will be abnormal. For example as correctly:
 
    ```
   Example:
@@ -91,6 +91,19 @@ The procedure for submitting the modification is the same as that for submitting
   The following content.
   ```
 
+- A blank line must be added before and after a table. Otherwise, the typesetting will be abnormal. Tables are not supported in ordered or unordered lists. For example as correctly:
+
+  ```
+  ## Title
+
+  | Header1  | Header2
+  | :-----   | :----
+  | Body I1  | Body I2
+  | Body II1 | Body II2
+
+  The following content.
+  ```
+  
 - Mark the reference interface, path name, file name in the tutorial and document with "\` \`". If it's a function or method, don't use parentheses at the end. For example:
   
   - Reference method 

CONTRIBUTING_DOC_CN.md

@@ -79,7 +79,7 @@
 
   ```
 
-- 图和图标题前后需增加一个空行，否则会导致排版异常。
+- 图和图标题前后需增加一个空行，否则会导致排版异常。正确举例如下：
 
    ```
   如下图所示：
@@ -91,6 +91,19 @@
   下文内容。
   ```
 
+- 表格前后需增加一个空行，否则会导致排版异常。有序或无序列表内不支持表格。正确举例如下：
+
+  ```
+  ## 文章标题
+
+  | 表头1   | 表头2
+  | :-----  | :----
+  | 内容I1  | 内容I2
+  | 内容II1 | 内容II2
+
+  下文内容。
+  ```
+
 - 教程、文档中引用接口、路径名、文件名等使用“\` \`”标注，如果是函数或方法，最后不加括号。举例如下：
   
   - 引用方法