docs: installation: linux: redhat-centos: fix broken yum repo example

[eschabell]

The .repo file examples had two-space indentation on every key, which
yum/dnf interprets as continuation lines, causing "failed loading
/etc/yum.repos.d/fluent-bit.repo, skipping". Removed the indentation,
added the missing $basearch to the primary baseurl, and normalized to
key=value format across all three examples in the page.

Fixes #2553

Summary by CodeRabbit

• Documentation
  • Updated Yum repository configuration examples and guidance for Red Hat/CentOS installations to improve accuracy and clarity.
  • Enhanced troubleshooting section with corrected repository URL configuration instructions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d6c13335-3bab-4cdd-8b52-9c8e95ee79f4

📥 Commits

Reviewing files that changed from the base of the PR and between 707fe9e and 3657a2a.

📒 Files selected for processing (1)

• installation/downloads/linux/redhat-centos.md

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📝 Walkthrough

Walkthrough

Red Hat/CentOS Fluent Bit installation documentation was corrected to fix broken Yum repository configuration syntax by removing invalid spaces around = operators in INI-format entries and standardizing the baseurl to include both $releasever and $basearch variables for proper package resolution.

Changes

Repository Configuration Syntax Fixes

Layer / File(s)	Summary
Main Repository Setup installation/downloads/linux/redhat-centos.md (lines 44–51)	The primary fluent-bit.repo example updated to use baseurl=https://packages.fluentbit.io/centos/$releasever/$basearch/ with corrected INI syntax (name=Fluent Bit without spaces around =).
FAQ Troubleshooting Initial Guidance installation/downloads/linux/redhat-centos.md (lines 94–97)	The "404 - Page not found" section simplified to show only essential fields (name and baseurl with $releasever/$basearch).
Detailed Troubleshooting Example installation/downloads/linux/redhat-centos.md (lines 105–111)	The "replace $releasever" example expanded with explicit OS release version (centos/7/$basearch/) and signing/enablement fields (gpgcheck, gpgkey, repo_gpgcheck, enabled) in corrected INI syntax.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Suggested labels

5.0

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰 With spaces removed from repo lines so neat,
The Yum parser now dances to the proper beat!
$releasever and $basearch align just right,
Fluent Bit installation now works at first sight. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing a broken yum repository example in the Red Hat/CentOS installation documentation.
Linked Issues check	✅ Passed	The PR addresses issue #2553 by removing indentation from .repo file examples, adding missing $basearch to baseurl, and normalizing all examples to key=value format, which resolves the yum/dnf parsing errors.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing the yum repository configuration examples as specified in issue #2553; no out-of-scope modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[eschabell]

@cosmo0920 ready for review!