docs: Update typo of string formatting output

[kepae]

The actual output is: 28 février 22

This example demonstrates date wrap around the era notation, but doesn't note the era. An alternative example might demonstrate subtraction without passing past 0 CE, but for now let's just fix the typo.

[ptomato]

Thanks! I'm guessing this was probably a copy-paste error.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.14%. Comparing base (69f46d5) to head (fd231b4).
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  Files          21       21           
  Lines        9928     9928           
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  Hits         9545     9545           
  Misses        336      336           
  Partials       47       47           

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