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docs update needed for reg proj

docs update needed for reg proj: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). This creates an error: reg proj(b1.r0, b1.beta, min=(0,0), max=(200,10), nloop=(50,50)) .. TypeError: 'tuple' object does not support item assignment

The task

This creates an error: ``` reg_proj(b1.r0, b1.beta, min=(0,0), max=(200,10), nloop=(50,50)) .. TypeError: 'tuple' object does not support item assignment ```

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.