Bulk change: move double quotes outside tokens (#4431)

pages.zh/common/echo.md

@@ -4,20 +4,20 @@
 
 - 输出文本信息. 注意: 引号是可选的:
 
-`echo {{"Hello World"}}`
+`echo "{{Hello World}}"`
 
 - 输出带有环境变量的信息:
 
-`echo {{"My path is $PATH"}}`
+`echo "{{My path is $PATH}}"`
 
 - 打印不带尾随换行符的信息：
 
-`echo -n {{"Hello World"}}`
+`echo -n "{{Hello World}}"`
 
 - 向文件添加信息:
 
-`echo {{"Hello World"}} >> {{file.txt}}`
+`echo "{{Hello World}}" >> {{file.txt}}`
 
 - 启用反斜杠转义的解释（特殊字符）:
 
-`echo -e {{"Column 1\tColumn 2"}}`
+`echo -e "{{Column 1\tColumn 2}}"`