feat: add docs for file coverage section

[nedaKaighobadi]

👀 Live preview

https://file-coverage-docs--docs-codacy.netlify.app/organizations/reporting/organization-overview/#coverage

🚧 To do

• If relevant, include the Jira issue key at the end of the pull request title
• Perform a self-review of the changes
• Fix any issues reported by the CI/CD

[github-actions]

Overall readability score: 54.09 (🟢 +0.02)

File	Readability
organization-overview.md	59.18 (🟢 +4.38)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
organization-overview.md	59.18	32.9	8.27	12.2	14.08	6.59
	🟢 +4.38	🟢 +8.56	🟢 +0.5	🟢 +0.3	🟢 +0.41	🟢 +0.34

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	54.09	42.98	10.95	12.33	12.24	8.02
	🟢 +0.02	🟢 +0.03	🟢 +0	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[codacy-production]

Codacy's Analysis Summary

0 new issues (≤ 0 minor issues)
0 new security issues
More details

AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes. Give us feedback}

[codacy-production]

Pull Request Overview

The PR documentation additions are compliant with Codacy standards and meet the defined acceptance criteria. Review findings are limited to minor formatting inconsistencies and punctuation errors within the metrics table. No security flaws or major logic bugs were identified.

About this PR

• The PR description is empty and does not provide context or links to relevant Jira tickets/issues.

Test suggestions

• Verify that the 'File coverage' calculation formula is documented.
• Verify that descriptions for distribution charts (Files by coverage percentage) are included.
• Verify that language-specific breakdown descriptions are included.
• Verify that the distinction between line coverage and file coverage sections is clear.

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🗒️ Improve review quality by adding custom instructions