Enhance documentation to explain addParams and dropParams functionality

[RedwindA]

• Add notes on addParams usage
• Example for max_tokens in addParams
• Clarify dropParams functionality
• Note default_params immutability
• Update links to relevant sections

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Name	Status	Preview	Comments	Updated (UTC)
librechat-ai	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 7, 2024 7:25pm

[fuegovic]

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