Update lora.md with a more accurate description of rank (#6724)
* Update lora.md with a more accurate description of rank
* Update docs/source/en/training/lora.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>