fix format

doc/manual/batch.md

@@ -20,14 +20,14 @@ ai2-kit tool batch gen_batches --help
 
 Suppose you want to run new CP2K tasks based on the previous runs, whose work directories can be found with `./old/iters*/label-cp2k/tasks/*`, and the new CP2K config file is in `./new/cp2k.inp`, then you can do the following steps:
 
-1. Create new tasks directories by linking to (or copying) the old ones
+#### 1. Create new tasks directories by linking to (or copying) the old ones
 
 ```bash
 ai2-kit tool batch map_path ./old/iters*/label-cp2k/tasks/* --target "new/task-{i:04d}"
 ```
 The command above will create new directories `new/task-0000`, `new/task-0001`, etc. and link the old tasks directories to them. If you want to copy the old tasks directories instead of linking them, you can use `--copy` option.
 
-2. Generate batch scripts
+#### 2. Generate batch scripts
 
 Suppose you are using SLURM as your job scheduler, then you need to prepare a header file for your batch scripts. For example, you can create a file named `header.sh` with the following content:
 
@@ -52,7 +52,7 @@ ai2-kit tool batch gen_batches new/task-* --header_file header.sh --cmd "mpirun
 
 The above command will generate 5 batch scripts named `new/cp2k-0.sbatch`, `new/cp2k-1.sbatch`, etc. and each batch script will run part of the tasks in `new/task-*` directory. 
 
-3. Submit batch scripts to your job scheduler
+#### 3. Submit batch scripts to your job scheduler
 You can submit the batch scripts to your job scheduler with `sbatch` and `xargs` commands.
 ```bash
 ls -1 new/cp2k-*.sbatch | xargs -I {} sbatch {}