Documentation Concern - upgrading pip3

[brubakerjeff]

Hi,

Not sure where to post this.

The instruction such as this could use some improvement "First, ensure that you have the latest pip; older versions may have trouble with some dependencies:

pip3 install --upgrade pip"

https://jupyter.readthedocs.io/en/latest/install.html

This can break pip3 installations such as myself with Ubuntu 18.04. pip3 was already an appropriate version as packaged by Ubuntu, upgrading pip creates incompatibilities.