Update Documentation for Quick Start Example: usage.rst

[adhiiisetiawan]

Update the documentation in the quick start example to improve clarity. The following changes have been made:

• Modified the command in the documentation to use the run_test_replay_buffer function instead of run_test in the reagent.gym.tests.test_gym module.
• Updated the example code snippet to reflect the change:

Before

# set the config
export CONFIG=reagent/gym/tests/configs/cartpole/discrete_dqn_cartpole_online.yaml
# train and evaluate model on gym environment
./reagent/workflow/cli.py run reagent.gym.tests.test_gym.run_test $CONFIG

After

# set the config
export CONFIG=reagent/gym/tests/configs/cartpole/discrete_dqn_cartpole_online.yaml
# train and evaluate model on gym environment
./reagent/workflow/cli.py run reagent.gym.tests.test_gym.run_test_replay_buffer $CONFIG

I also change in "On-Policy Training" section

These changes ensure that the example aligns with the current implementation and usage of the reagent.gym.tests.test_gym module.

Please review these modifications and let me know if any further adjustments are needed.

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