chore: remove outdated env var

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• Documentation
  • Updated the environment variables reference guide to remove an outdated configuration entry.

[coderabbitai]

Walkthrough

A documentation entry for the FOREST_FEES_FIP0115HEIGHT environment variable is removed from the environment variables reference guide, eliminating its type, default value, and description.

Changes

Cohort / File(s)	Summary
Documentation docs/docs/users/reference/env_variables.md	Removed FOREST_FEES_FIP0115HEIGHT environment variable entry from the reference table.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fix: make FIP-0115 activation height configurable #6830: Adds FOREST_FEES_FIP0115HEIGHT configuration and implementation code, directly conflicting with the removal of its documentation in this PR.

Suggested reviewers

• akaladarshi
• sudo-shashank

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: remove outdated env var' accurately and concisely describes the main change: removing an environment variable from documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch remove-outdated-var

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch remove-outdated-var

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