Update zipapp section to indicate where past virtualenv.pyz can be found

[goodwillcoding]

Addresses some of the concerns in #2080

Thanks for contributing, make sure you address all the checklists (for details on how see

development documentation)!

• ran the linter to address style issues (tox -e fix_lint)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
• updated/extended the documentation

[codecov]

Codecov Report

Merging #2081 (2139a20) into main (742e145) will decrease coverage by 0.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2081      +/-   ##
==========================================
- Coverage   93.67%   93.08%   -0.60%     
==========================================
  Files          88       88              
  Lines        4380     4380              
==========================================
- Hits         4103     4077      -26     
- Misses        277      303      +26     

Flag	Coverage Δ
tests	93.08% <ø> (-0.60%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/virtualenv/util/path/_pathlib/__init__.py	30.30% <0.00%> (-63.64%)	⬇️
...ualenv/create/via_global_ref/builtin/pypy/pypy3.py	94.87% <0.00%> (-5.13%)	⬇️
src/virtualenv/info.py	95.00% <0.00%> (-5.00%)	⬇️
src/virtualenv/seed/embed/base_embed.py	96.22% <0.00%> (-1.89%)	⬇️
src/virtualenv/discovery/py_info.py	94.78% <0.00%> (-0.31%)	⬇️
.../create/via_global_ref/builtin/cpython/cpython2.py	98.50% <0.00%> (+1.49%)	⬆️

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[gaborbernat]

[gaborbernat]

Released via https://pypi.org/project/virtualenv/20.4.4/