Fix docs around name for distilled LORA path VAR

[q5sys]

I figure its eaiser to fix the docs than the code since runners may exist that already depend on the exact VAR name.

Docs say:
--distilled-lora-path path/to/distilled_lora.safetensors \ @ https://github.com/Lightricks/LTX-2/edit/main/packages/ltx-pipelines/README.md

but the code says:
distilled_lora: list[LoraPathStrengthAndSDOps],
@ https://github.com/Lightricks/LTX-2/blob/main/packages/ltx-pipelines/src/ltx_pipelines/ti2vid_two_stages.py#L52

Which causes a failure when the docs are followed:

python -m ltx_pipelines.ti2vid_two_stages \
--checkpoint-path /zstor/ai/ltx2/LTX-2/ltx-2-19b-dev.safetensors \
--distilled-lora-path /zstor/ai/ltx2/LTX-2/ltx-2-19b-distilled-lora-384.safetensors \
--spatial-upsampler-path /zstor/ai/ltx2/LTX-2/ltx-2-spatial-upscaler-x2-1.0.safetensors \
--gemma-root /zstor/ai/ltx2/ComfyUI/models/text_encoders/gemma_3_12B/ \
--prompt "a beautiful sunset over the ocean" \
--negative-prompt "blurry, out of focus" \
--output-path output.mp4 \
--height 480 \
--width 720 \
--frame-rate 24 \
--num-frames 96 \
--num-inference-steps 40 \
--cfg-guidance-scale 4 \
--seed 42 \
--enable-fp8

Error:

ti2vid_two_stages.py: error: the following arguments are required: --distilled-lora

[q5sys]

derp... didn't check to see if there was already a PR for this. Turns out #20 covers it.
Closing PR as dupe.