field clause required for go and fetch statements (#1823)

* field clause required for go and fetch statements

* Update ngql-style-guide.md

docs-2.0/3.ngql-guide/1.nGQL-overview/ngql-style-guide.md

@@ -108,13 +108,13 @@ nGQL 没有严格的构建格式要求，但根据恰当而统一的风格创建
  不推荐：
 
  ```ngql
- go from "player100" over Follow
+ match (V:player) return V limit 5;
  ```
 
  推荐：
 
  ```ngql
- GO FROM "player100" OVER follow
+ MATCH (v:player) RETURN v LIMIT 5;
  ```
 
 ## Pattern
@@ -202,13 +202,13 @@ nGQL 没有严格的构建格式要求，但根据恰当而统一的风格创建
  不推荐：
 
  ```ngql
- FETCH PROP ON player "player100"
+ FETCH PROP ON player "player100" YIELD properties(vertex);
  ```
 
  推荐：
 
  ```ngql
- FETCH PROP ON player "player100";
+ FETCH PROP ON player "player100" YIELD properties(vertex);
  ```
 
 2. 使用管道符（|）分隔的复合语句，仅在最后一行末用英文分号结尾。在管道符前使用英文分号会导致语句执行失败。