DOC: Add VSCode help link to importerror troubleshooting
DOC: Add VSCode help link to importerror troubleshooting

Adds the environment variable help link:
https://code.visualstudio.com/docs/python/environments
for VSCode.

Closes gh-16139 and gh-15183

numpy/numpy,pbrod/numpy,numpy/numpy,jakirkham/numpy,numpy/numpy,madphysicist/numpy,pbrod/numpy,numpy/numpy,pbrod/numpy,charris/numpy,grlee77/numpy,mhvk/numpy,pbrod/numpy,simongibbons/numpy,mattip/numpy,simongibbons/numpy,rgommers/numpy,jakirkham/numpy,pdebuyl/numpy,endolith/numpy,simongibbons/numpy,pdebuyl/numpy,jakirkham/numpy,mhvk/numpy,grlee77/numpy,endolith/numpy,mhvk/numpy,mattip/numpy,jakirkham/numpy,madphysicist/numpy,anntzer/numpy,mhvk/numpy,grlee77/numpy,anntzer/numpy,anntzer/numpy,rgommers/numpy,madphysicist/numpy,pdebuyl/numpy,charris/numpy,rgommers/numpy,grlee77/numpy,seberg/numpy,abalkin/numpy,seberg/numpy,charris/numpy,abalkin/numpy,madphysicist/numpy,anntzer/numpy,madphysicist/numpy,seberg/numpy,endolith/numpy,simongibbons/numpy,rgommers/numpy,grlee77/numpy,simongibbons/numpy,mattip/numpy,jakirkham/numpy,pdebuyl/numpy,abalkin/numpy,pbrod/numpy,mattip/numpy,seberg/numpy,endolith/numpy,mhvk/numpy,charris/numpy