[tex-live] Docu update proposal

[Philip Taylor]

George N. White III wrote:

> Some TeX Live users are not familiar with the ways to manage environment
> variables, so please consider providing examples for Windows and POSIX sh.

In which case, please omit the word "shell" from the proposed text. 
Windows users do not use shells, although many/most are familiar with 
the concept of the CMD prompt.

Philip Taylor