Fix broken import in doc

[CarlSchwan]

Description of the Change

inport os.environ is incorrect since environ is not a module, instead we just need to do import os and use os.environ

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added (not needed, no new code)
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS (not sure if this is needed, that change is not copyrightable because it's too trivial)

[n2ygk]

Thanks for this!

[n2ygk]

@CarlSchwan Please do add yourself to AUTHORS anyway. It's not about copyright but about credit for contributing.

[codecov]

Codecov Report

Merging #1121 (280a824) into master (5531cb9) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #1121 +/- ## ======================================= Coverage 96.62% 96.62% ======================================= Files 32 32 Lines 1806 1806 ======================================= Hits 1745 1745 Misses 61 61 

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[n2ygk]

@CarlSchwan Please do add yourself to AUTHORS anyway. It's not about copyright but about credit for contributing.

Never mind. I did it.

[CarlSchwan]

@CarlSchwan Please do add yourself to AUTHORS anyway. It's not about copyright but about credit for contributing.

Never mind. I did it.

Thanks!