docs: blob: fix ring buffer config key prefix

[jinyongchoi]

Rename threaded.ring_buffer.capacity and threaded.ring_buffer.window to thread.ring_buffer.capacity and thread.ring_buffer.window to match the actual config keys registered in Fluent Bit source code (flb_input.c input_global_properties[]) and to be consistent with other input plugin documentation (tail, opentelemetry, etc.).

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[Copilot]

Pull request overview

This PR updates the Blob input plugin documentation to use the correct ring buffer configuration key prefix, aligning it with the actual Fluent Bit configuration and other input plugin docs.

Changes:

• Renames threaded.ring_buffer.capacity to thread.ring_buffer.capacity in the Blob input configuration table.
• Renames threaded.ring_buffer.window to thread.ring_buffer.window in the same table.
• Ensures the Blob input docs are consistent with other inputs (e.g., tail, opentelemetry, prometheus-textfile) and the underlying Fluent Bit configuration keys.

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