Fix errors in .editorconfig

[iav]

Fix two errors in .editorconfig since #4266:

1. [*.md] section: Replace incorrect insert_final_newline = false with
   trim_trailing_whitespace = false.
   Markdown uses trailing whitespace (two spaces at end of line) to produce hard line
   breaks per the CommonMark spec.
   Trimming trailing whitespace would break this functionality. Meanwhile, disabling
   insert_final_newline for markdown files was unintentional — final newlines should be
   preserved per POSIX and the global [*] section already sets it to true.

2. [*.{yaml,yml}] section: Remove redundant insert_final_newline = false.
   YAML files should end with a final newline, as required by [POSIX](https://pubs.open
   group.org/onlinepubs/9699919799.2008edition/basedefs/V1_chap03.html#tag_03_403) and
   expected by most YAML linters. The global [*] section already sets
   insert_final_newline = true, so the per-section override to false was incorrect.

Summary by CodeRabbit

• Chores
  • Updated development configuration settings for code formatting standards across project files.

[coderabbitai]

📝 Walkthrough

Walkthrough

Configuration update to .editorconfig file adjusts trailing whitespace handling for Markdown files and modifies the newline policy for YAML files. Total changes: 1 line added, 2 lines removed.

Changes

Cohort / File(s)	Summary
Editor Configuration .editorconfig	Updated Markdown file handling to disable trailing whitespace trimming; removed explicit newline insertion setting for YAML files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A tiny tweak to how we write,
No trailing spaces left in sight,
YAML files now find their way,
With simpler rules for every day! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix errors in .editorconfig' directly summarizes the main change—correcting incorrect settings in the .editorconfig file that were introduced by a previous PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!