docs: Fix a few typos

[timgates42]

There are small typos in:

• fire/console/console_attr.py
• fire/custom_descriptions.py

Fixes:

• Should read support rather than suport.
• Should read pertinent rather than pertinant.
• Should read environment rather than envrionment.

Semi-automated pull request generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

[dbieber]

Thanks for fixing these typos!

The console/ directory is actually a third_party dep and we don't generally update that code manually (since the updates just get clobbered when we pull in from upstream.) I'll merge your PR as is though (and if/when we next pull in a console update, the typos might return!)