Update oraclewriter.md

fullColumn typo error

Author: geosmart

docs/offline/writer/oraclewriter.md

@@ -73,7 +73,7 @@
 
 <br/>
 
-- **fullcolumn**
+- **fullColumn**
   - 描述：目的表中的所有字段，字段之间用英文逗号分隔。例如: "column": ["id","name","age","hobby"]，如果不配置，将在系统表中获取
   - 必选：否
   - 字段类型：List