docs: clarify reward kernel flags

[william-xue]

Summary

• Clarify how Grid2Op reward classes receive contextual flags in addition to the usual MDP reward-kernel inputs.
• Explain that these flags distinguish the agent-submitted action from the action effectively applied by the environment, e.g. when an out-of-bounds redispatching action is replaced by do-nothing.

Validation

• git diff --check
• python3 content check for the added reward documentation note

Closes #737

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[BDonnot]

Hello,

Thanks again for this fix.

Same (minor) issue as for the your other one. You did not signoff (Developer Certificate of Origin (DCO) ) your commit.

Doing it is really easy in your case, you simply need, locally to type:

git commit --amend -s
git push --force

should do the trick.

The first line will simply add a "signed off by " in the message commit, which is required to contribute to open source projects hosted by the linux fundation. See https://developercertificate.org/ for more information.

Thanks again and let me know if you encounter any issues