Warning message on NPM Registry documentation

References

Merged MR that introduced documentation requiring review: !18515 (merged)

Related issue(s): #12417 (closed)

Further Details

Documentation update to warn users that they can't:

• Update path of a group which is also a root namespace for Project.
• Transfer a subgroup containing Project out of its root namespace.
• Transfer Project out of its root namespace.

when Project contains NPM packages.