Docs: Update Inception provider documentation for Mercury-2 model

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Summary

The Inception Labs provider documentation needs updates following PR #12156 which added the Mercury-2 model.

Missing Documentation

• Mercury-2 model (128k context, tool/function calling support)
• Mercury-Edit-2 and Mercury-Coder-Small models
• Tool calling capabilities for Mercury-2
• Example configurations showing tool_use capability

Current State

The existing Inception docs at /docs/customize/model-providers/top-level/inception.mdx have generic placeholder examples but don't mention specific models or their capabilities.

Suggested Updates

1. Add specific Mercury-2 model configuration examples
2. Document tool calling support for Mercury-2
3. Add model-specific context length and capability information
4. Reference the Mercury-2 model in model recommendations

Related PR

• feat: add Inception Labs mercury-2 model #12156 - feat: add Inception Labs mercury-2 model

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Co-Authored-By: Continue noreply@continue.dev
Co-authored-by: bekahhw rhawrot@gmail.com