remove newline replace to fix formatting of help options

[lastephey]

Addresses https://github.com/NERSC/podman-hpc/issues/77

It looks like we had an unnecessary newline replace with a double escape. I took it out and tested and it looks ok.

Without fix:

stephey@alvarez:login01:~> podman-hpc run --help
Run a command in a new container

Description:
  Runs a command in a new container from the given image

Usage:
  podman-hpc run [options] IMAGE [COMMAND [ARG...]]

Examples:
  podman-hpc run imageID ls -alF /etc
  podman-hpc run --network=host imageID dnf -y install java
  podman-hpc run --volume /var/hostdir:/var/ctrdir -i -t fedora /bin/bash

Podman-hpc Options:\n  --cuda-mpi  Enable CUDA-aware Cray MPICH Support\n  --cvmfs     Enable cmvfs filesystem\n  --gpu       Enable NVIDIA GPU Support\n  --mpi       Enable Cray MPICH Support\n  --nccl      Enable SS11 support for NCCL\n\nPodman options follow:
      --add-host strings                         Add a custom host-to-IP mapping (host:ip) (default [])
      --annotation strings                       Add annotations to container (key=value)
      --arch ARCH                                use ARCH instead of the architecture of the machine for choosing images
  -a, --attach strings                           Attach to STDIN, STDOUT or STDERR

With fix:

stephey@nid200000:~> podman-hpc run --help
Run a command in a new container

Description:
  Runs a command in a new container from the given image

Usage:
  podman-hpc run [options] IMAGE [COMMAND [ARG...]]

Examples:
  podman-hpc run imageID ls -alF /etc
  podman-hpc run --network=host imageID dnf -y install java
  podman-hpc run --volume /var/hostdir:/var/ctrdir -i -t fedora /bin/bash

Podman-hpc Options:
  --cuda-mpi  Enable CUDA-aware Cray MPICH Support
  --cvmfs     Enable cmvfs filesystem
  --gpu       Enable NVIDIA GPU Support
  --mpi       Enable Cray MPICH Support
  --nccl      Enable SS11 support for NCCL

Podman options follow:
      --add-host strings                         Add a custom host-to-IP mapping (host:ip) (default [])
      --annotation strings                       Add annotations to container (key=value)
      --arch ARCH                                use ARCH instead of the architecture of the machine for choosing images
  -a, --attach strings                           Attach to STDIN, STDOUT or STDERR

[danfulton]

This looks fine to me if it works. I'm not sure why I would have written it the other way in the first place.