Fix the path in Step 5 of '04-ComfyUI/ComfyUISetup.md'

[PuzzleDog]

Step 5 (Download and Place Checkpoint Models) currently has the following:

1. Navigate to the Checkpoints Directory:
   cd /home/mukul/dev-ai/vison/models/checkpoints

Issue seen:
As written, the path '/home/mukul/dev-ai' is only correct if the user 'mukul' is running the command.

Recommended fix:
Change the command to be similar to that of Step 1:
cd ~/dev-ai/vison/models/checkpoints

This recommended fix should work for all users on all systems.