Obsolete references to `--experiment-dir` removed evo2 parameter

[MaozGelbart]

Hi, thanks for the framework!

--experiment-dir parameter of train_evo2 command was removed as part of #740, but there are still some references to it:

bionemo-framework/sub-packages/bionemo-evo2/README.md

Line 194 in bc468a7

To supply a pre-trained checkpoint, pass the NeMo2 checkpoint directory to `--ckpt-dir`, and the script will dump newly trained checkpoints and logs to `--experiment-dir`. However, if there are existing well-defined checkpoints in the directory specified by `--experiment-dir`, the script will automatically resume training from the most recent checkpoint in the experiment directory instead of starting from the checkpoint specified by `--ckpt-dir`, which streamlines long training sessions. (To disable this behavior, supply a new or clean `--experiment-dir` when restarting from `--ckpt-dir`.)

bionemo-framework/docs/docs/main/getting-started/using-slurm.md

Line 89 in bc468a7

--experiment-dir=/workspace/bionemo2/model/checkpoints/${EXPERIMENT_NAME} \

It's probably best to remove or alter these obsolete references.

[dorotat-nv]

@MaozGelbart , I assume you refer to the ToT main, the latest commit is 0d162d5ffe97eee471d259e13d82f212f5b4dc5d