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Relocating Documents Folder Off the Boot Drive
If you have moved your entire home directory, then there is no need to move the Documents folder, since the Documents folder is inside the home dir.
No real need to move or use the 'Document' directory
There is nothing special about the Documents folder other than the irritating insistence of applications on navigating there as the default save location.
You can, for example, dedicate a separate volume/drive for your data, and save everything there, and forget about the idiot-mode Documents folder entirely.
How to relocate the Documents folder
Too many readers were unable to do it right. See above.