update readme

README.md

@@ -74,7 +74,7 @@ def auto_set(num, allow_nonfree=True, ask=True, blacklist=[], show=True):
 	# some code here.
 ```
 
-# Use this inside an docker.
+## Use this inside an docker.
 For some reason, codes that running in docker cannot get the correct information about the process that using the gpu. 
 To support that, gpuutil supports read the output command of nvidia-smi and ps from an given file, which should be generated by you from host machine
 To use this in docker, try the following steps:
@@ -91,6 +91,7 @@ user1  97 tmux
 user1  98 -zsh
 ```
 if your generated output have different name, for example when you are using ```docker top``` instead of ```ps```, the ```COMMAND``` section would be ```CMD```, therefore you need prepare a dict that maps its name to either of ```user, pid, command```, note that its insensitive to upper case.
+
 3. run the configuration script.
 ```shell
 python -m gpuutil.set_redirect -nv path/to/your/nvidia/output -ps /path/to/your/ps/output -pst cmd=command,username=user