fix(README): fix command to run in build instructions

README-CN.md

@@ -49,7 +49,7 @@ docker run -d --name emqx -p 1883:1883 -p 8081:8081 -p 8083:8083 -p 8883:8883 -p
 git clone https://github.com/emqx/emqx.git
 cd emqx
 make
-_build/emqx/rel/emqx/bin console
+_build/emqx/rel/emqx/bin/emqx console
 ```
 
 对于 4.3 之前的版本，通过另外一个仓库构建：

README-RU.md

@@ -50,7 +50,7 @@ docker run -d --name emqx -p 1883:1883 -p 8081:8081 -p 8083:8083 -p 8883:8883 -p
 git clone https://github.com/emqx/emqx.git
 cd emqx
 make
-_build/emqx/rel/emqx/bin console
+_build/emqx/rel/emqx/bin/emqx console
 ```
 
 Более ранние релизы могут быть собраны с помощью другого репозитория:

README.md

@@ -49,7 +49,7 @@ For 4.3 and later versions.
 git clone https://github.com/emqx/emqx.git
 cd emqx
 make
-_build/emqx/rel/emqx/bin console
+_build/emqx/rel/emqx/bin/emqx console
 ```
 
 For earlier versions, release has to be built from another repo.