Fix lora_combiner docs.

[excepto64]

To solve issue #10.

[gemini-code-assist]

Code Review

This pull request updates the documentation in docs/source/common_options.rst to use --ds.param_dtype bf16 in an example command. However, the reviewer noted that the lora_combiner script is a standalone utility that does not support this DeepSpeed-specific parameter, and suggested using the --bf16 flag instead.

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[gemini-code-assist]

The lora_combiner script is a standalone utility that does not use the DeepSpeed trainer's dotted argument parser. It does not support --ds.param_dtype bf16. Instead, it uses a simple --bf16 boolean flag to enable bfloat16 precision during merging.

Suggested change

	--ds.param_dtype bf16
	--bf16

[excepto64]

This does not square with the output I got while running the code:

usage: lora_combiner.py [-h] --model_path MODEL_PATH --lora_path LORA_PATH
                        --output_path OUTPUT_PATH [--is_rm]
                        [--ds.param_dtype {bf16,fp16}]
lora_combiner.py: error: unrecognized arguments: --param_dtype bf16