Fix inaccuracies in LLM documentation (llms-full.txt + llms.txt)

[Copilot]

Several factual inaccuracies in the LLM docs were flagged in review: wrong package name, misrepresented pooling behavior, undocumented no-op config fields, and an incorrect exception class count.

Changes

• Package name: install commands corrected from row-query → rowquery
• Code fence: install block changed from python → bash (these are shell commands)
• Pooling description: replaced "delegates to underlying drivers / no own pool" with accurate description of the current simple in-memory list-based pool (create_pool() returns a list, acquire_connection() does pool.pop())
• pool_timeout / pool_recycle: marked as "Reserved for future use. Currently has no effect at runtime." — neither field is wired up in any adapter
• Exception count: removed stale (18 classes) qualifier from llms.txt; exceptions.py defines 20 classes

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