Fix markdown heading formatting and typo in documentation

.github/PR_PREFERENCES.md

@@ -4,7 +4,7 @@ This repository prefers plain Git for local operations and the GitHub web UI for
 creating pull requests. This note documents that preference so contributors and
 automation respect the chosen workflow.
 
-Recommendations
+## Recommendations
 
 - Use git to create branches, stage, commit, and push. Example:
 
@@ -33,7 +33,7 @@ git push -u origin fix/my-change
 - If you integrate other tools (for example GitKraken or GitHub Apps), only do
   so after confirming credentials and access are explicitly authorized.
 
-Why this preference
+## Why this preference
 
 - Plain `git` is universally available and works in CI and local shells without
   adding additional tooling requirements.

PowerShell/system-administration/maintenance/README.md

@@ -5,23 +5,23 @@ This folder contains PowerShell scripts focused on system maintenance tasks.
 Typical responsibilities include package cleanup, service health checks,
 temporary-file housekeeping, and other routine maintenance utilities.
 
-Usage and placement
+## Usage and placement
 
 - Place small, single-purpose maintenance scripts here.
 - For complex tools with multiple files, include a top-level README and a
   subfolder with implementation files.
 
-Naming and contribution
+## Naming and contribution
 
 - Use descriptive kebab-case names, e.g. `clean-temp-folders.ps1` or
   `check-service-health.ps1`.
 - Add header documentation (comment-based help) and examples for each script.
 - Include `-WhatIf` support for potentially destructive operations.
 
-Examples
+## Examples
 
 - `clean-temp-folders.ps1` — remove old files from temporary directories
-- `rotate-logs.ps1` — rotate and compress rotating logs
+- `rotate-logs.ps1` — rotate and compress log files
 
 Thank you for contributing maintenance scripts — please follow the
 repository's contribution guidelines in the main `CONTRIBUTING.md`.