Fix installation instructions for pgEdge on RHEL

[zaidshabbir25]

Removed unnecessary 'dnf' installation command from prerequisites.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 6b8d9921-29e0-44be-a6a8-c18937d23622

📥 Commits

Reviewing files that changed from the base of the PR and between 12fdcd5 and 8cc43b2.

📒 Files selected for processing (1)

• docs/installation/systemd-installation.md

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📝 Walkthrough

Walkthrough

The systemd installation guide updates its RPM prerequisites command to install only epel-release, removing the additional dnf package argument.

Changes

Systemd installation documentation

Layer / File(s)	Summary
RPM prerequisite command docs/installation/systemd-installation.md	The RPM prerequisites command now installs only epel-release.

Poem

I’m a rabbit with a tidy decree,
“Just one package is plenty for me!”
EPEL hops in place,
While dnf leaves no trace,
And the guide grows as neat as can be.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is missing the required Summary, Changes, Testing, Checklist, and Notes sections from the template.	Add the template sections with a brief summary, bullet list of changes, testing steps, checklist items, and reviewer notes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: fixing pgEdge installation instructions for RHEL.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zaidshabbir25-patch-1

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[codacy-production]

Up to standards ✅

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[jason-lynch]

@zaidshabbir25 As per your suggestion to link to the PEP repo docs, I've removed this part of the text in my PR: #448

That change will merge into main when we finalize the release. Could you please take a look and see if that addresses this issue?