fix typo in example code

[GhostPirateBob]

fix $temperature->getFormatteed in example code
fix percipitation in docs

Hi @cmfcmf, I'm kind of glad I found this typo because it gives me a chance to leave a comment and say thanks for the great job with this repo!

It was delightful to use the Unit class. Makes me regret writing my own implementation the last few times.

Anyways, hope I've filed this in the right way for contributions, it's just a tiny typo in the example code. The actual code in the repo is correct and doesn't need to change.

Keep up the great work, thanks!

gpb. ✌(◕‿-)✌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.33%. Comparing base (2ffe2c7) to head (8dfe070).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #193   +/-   ##
=========================================
  Coverage     90.33%   90.33%           
  Complexity      179      179           
=========================================
  Files            18       18           
  Lines           414      414           
=========================================
  Hits            374      374           
  Misses           40       40           

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[cmfcmf]

Thanks a lot!