docs: fix stale Args in EmbeddingsRegistry.register_model docstring

[FBISiri]

What

EmbeddingsRegistry.register_model() accepts only (name, embedding_cls), but its docstring documents two extra parameters that don't exist on the method:

@classmethod
def register_model(cls, name: str, embedding_cls: type[BaseEmbeddings]) -> None:
    """Register a new embeddings implementation.

    Args:
        name: Unique identifier for this implementation
        embedding_cls: The embeddings class to register
        pattern: Optional regex pattern string or compiled pattern          # <- not a parameter
        supported_types: Optional list of types that the embeddings class supports  # <- not a parameter
    """

pattern and supported_types belong to the sibling classmethods register_pattern() and register_types(), which were split out into their own methods. The register_model() docstring was left describing the old combined signature.

This PR removes the two stale Args entries so the docstring matches the actual signature.

Why

The docstring is the public API reference (and feeds the generated docs). Documenting non-existent pattern / supported_types arguments misleads users into passing kwargs that raise TypeError, and trips docstring/signature consistency checks.

How verified

• register_pattern() / register_types() confirmed as the real homes of these parameters (same file).
• ruff check src/chonkie/embeddings/registry.py → All checks passed!
• Documentation-only change: no code behavior changes, no tests affected.

Scope

Small and self-contained — a 2-line docstring correction in a single file. No behavior change.

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[gemini-code-assist]

Code Review

This pull request updates the docstring for the register_model method in src/chonkie/embeddings/registry.py by removing the documentation for the pattern and supported_types arguments, which are no longer part of the function signature. I have no feedback to provide.

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