docs: v6.6.2 catch-up - #68

Running Vale across on the following files affected by this PR:

- node/index.mdx
- node/technical-reference.mdx
- node/validators.mdx

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node/index.mdx:
	- 22:4     Use sentence case for headings: 'Network Versions'.
	- 28:4     Use sentence case for headings: 'Hardware Requirements'.
	- 37:4     Use sentence case for headings: 'Installation & Setup Steps'.
	- 50:8     Use sentence case for headings: '2. Install Essential Packages'.
	- 56:8     Use sentence case for headings: '3. Synchronize System Time'.
	- 64:7     Use sentence case for headings: 'Install Go'.
	- 74:8     Use sentence case for headings: 'Installation Steps'.
	- 209:7    Use sentence case for headings: 'Initialize Chain Files'.
	- 244:7    Use sentence case for headings: 'Configure App Settings'.
	- 274:6    Use sentence case for headings: 'Archive Node Setup'.
	- 288:6    Use sentence case for headings: 'Mempool Configuration'.
	- 382:7    Use sentence case for headings: 'Monitoring & Troubleshooting'.
	- 418:4    Use sentence case for headings: 'Node Resources'.
	- 420:5    Use sentence case for headings: 'Node Setup'.
	- 434:5    Use sentence case for headings: 'Advanced Operations'.

node/technical-reference.mdx:
	- 12:4     Use sentence case for headings: 'Command Line Interface Reference'.
	- 18:5     Use sentence case for headings: 'Node Management Commands'.
	- 40:5     Use sentence case for headings: 'seidb Tooling Commands'.
	- 44:6     Use sentence case for headings: 'Reporting FlatKV EVM Migration Status'.
	- 70:6     Use sentence case for headings: 'Comparing EVM State Across Backends'.
	- 110:5    Use sentence case for headings: 'Autobahn (GigaRouter) Config Generation'.
	- 141:6    Use sentence case for headings: 'Giga Mode Behavior and Per-Block Limits'.
	- 159:6    Use sentence case for headings: 'Autobahn Committee and Network Message Limits'.
	- 178:5    Use sentence case for headings: 'Key Management'.
	- 203:5    Use sentence case for headings: 'Transaction Commands'.
	- 221:4    Use sentence case for headings: 'Configuration Parameters'.
	- 226:5    Use sentence case for headings: 'App.toml Parameters'.
	- 338:4    Use sentence case for headings: 'Network Parameters'.
	- 342:5    Use sentence case for headings: 'Chain Parameters'.
	- 370:4    Use sentence case for headings: 'File Locations'.

node/validators.mdx:
	- 9:4      Use sentence case for headings: 'Understanding Validator Responsibilities'.
	- 18:4     Use sentence case for headings: 'Initial Setup'.
	- 36:5     Use sentence case for headings: 'Key Management'.
	- 50:5     Use sentence case for headings: 'Hardware Security Module (HSM) Integration'.
	- 62:3     Use sentence case for headings: 'Generate key in HSM'.
	- 107:4    Use sentence case for headings: 'Monitoring and Alerting'.
	- 111:4    Use sentence case for headings: 'Security Practices'.
	- 113:5    Use sentence case for headings: 'Network Security'.
	- 133:5    Use sentence case for headings: 'Key Management Practices'.
	- 158:3    Use sentence case for headings: 'Create SHA256 checksums'.
	- 190:5    Use sentence case for headings: 'Emergency Procedures'.
	- 196:4    Use sentence case for headings: 'Governance Participation'.
	- 217:4    Use sentence case for headings: 'Recovery Procedures'.
	- 219:5    Use sentence case for headings: 'Critical Warning: Double-Signing Prevention'.
	- 235:5    Use sentence case for headings: 'Validator Recovery'.


Found 45 suggested changes across 3 files in 676.37ms