[BugFix] Minor fix in the logging of PPO and A2C examples

[albertbou92]

Description

Minor fix in the logging of PPO and A2C examples

Motivation and Context

Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.
You can use the syntax close #15213 if this solves the issue #15213

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Remove all that do not apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of examples)

Checklist

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If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/1693

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures, 17 Unrelated Failures

As of commit 90b209c with merge base 44dd79f ():

NEW FAILURES - The following jobs have failed:

• Generate documentation / upload (gh)
• Olddeps Tests on Linux / unittests (3.8, 11.6) / linux-job (gh)
• Unit-tests on Windows CPU / unittests / windows-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
• Continuous Benchmark (PR) / GPU Pytest benchmark (linux.4xlarge.nvidia.gpu, 3.8) (gh)
• Examples Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
• Generate documentation / build-docs (3.9, 12.1) / linux-job (gh)
• Habitat Tests on Linux / tests (3.9, 11.6) / linux-job (gh)
• Optdeps Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
• Tests on Linux GPU (Gym) / unittests (3.9, 12.1) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.11) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.8) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.9) / linux-job (gh)
• Unit-tests on Linux GPU / tests (3.8, 12.1) / linux-job (gh)
• Unit-tests on Linux GPU, latest stable release / tests (3.8, 11.8) / linux-job (gh)
• Unit-tests on MacOS CPU / tests (3.11) / macos-job (gh)
• Unit-tests on MacOS CPU / tests (3.8) / macos-job (gh)
• Unit-tests on Windows GPU / unittests / windows-job (gh)
• Vmas Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)

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[vmoens]

LGTM thx for this