Fix blockPersister.md formatting and directory structure

[torrejonv]

• Remove multiple consecutive blank lines (MD012)
• Add missing blank line before heading (MD022)
• Update directory structure with complete file listing
• Fix run command to include dot before flags

[github-actions]

🤖 Claude Code Review

Status: Complete

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Current Review:

This PR makes clean documentation improvements to blockPersister.md:

✅ Formatting fixes:

• Removes extra blank lines (MD012)
• Adds missing blank line before heading (MD022)

✅ Directory structure update:

• All listed files exist and match the actual directory structure
• Verified: Server.go, Server_test.go, persist_block.go, persist_block_test.go, processSubtree.go, processTxMetaUsingStore.go, metrics.go, and state/ subdirectory

✅ Documentation quality:

• Improved directory tree with proper file descriptions
• Better alignment and readability

No issues found. The changes are accurate and improve documentation quality.