Update docs regarding base env use

[DaveKaretnyk]

Update conda-build docs to recommend use with base-env only

Documentation solution to problem discussed here: #4995

Checklist - did you ...

• Add a file to the news directory (using the template) for the next release's release notes?
• Add / update necessary tests?
• Add / update outdated documentation?

[conda-bot]

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In order for us to review and merge your code, please e-sign the Contributor License Agreement PDF. We then need to manually verify your signature, merge the PR (conda/infrastructure#824), and ping the bot to refresh the PR.

[kenodegard]

@conda-bot check

[kathatherine]

Got some general punctuation/wording suggestions. Let me know if you have any questions and thanks for your contribution!

[DaveKaretnyk]

@kathatherine: thanks, updated content as per house style.

[kathatherine]

Thanks!

[beeankha]

A few edit suggestions, otherwise LGTM!

[DaveKaretnyk]

Thanks all for the review comments, making the final changes, and merging.

I have a question regarding your procedures, especially for doc changes like this. Should the submitter (me) make / discuss the review suggestions or should it be left to Anaconda employees to take care of? E.g. a bunch of them are house style changes....

[kenodegard]

@DaveKaretnyk either works, simple grammatical and formatting changes are often just committed by maintainers (done with good intentions in an effort to decrease the amount of back and forth necessary), more substantial changes will likely to be discussed further