fix(batch): update batch tool definition to outline correct value for max tool calls

[jamesmengo]

Fixes #9519

What does this PR do?

Tiny fix to keep batch tool documentation consistent with the code.

#9275 increased the batch tool's max limit from 10 to 25 in batch.ts, but the documentation in batch.txt incorrectly says "1–20" instead of "1–25".

opencode/packages/opencode/src/tool/batch.ts

Lines 36 to 37 in aa4b06e

	const toolCalls = params.tool_calls.slice(0, 25)
	const discardedCalls = params.tool_calls.slice(25)

How did you verify your code works?

Docs update.

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