docs: Fix a few typos

[timgates42]

There are small typos in:

• docs/configuration.rst
• i3pystatus/calendar/google.py
• i3pystatus/coin.py
• i3pystatus/core/modules.py
• i3pystatus/ping.py
• i3pystatus/sabnzbd.py
• i3pystatus/timer.py

Fixes:

• Should read occurred rather than occured.
• Should read subtracts rather than substracts.
• Should read specify rather than specifiy.
• Should read remaining rather than remainig.
• Should read recommended rather than recomended.
• Should read property rather than propertie.
• Should read available rather than availible.

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

[terminalmage]

Thanks!