Fixed:typos

[shenxiangzhuang]

Fix some typos which are found when I'm reading the code~

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b8cf576) 100.00% compared to head (58ab325) 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##            master       #58    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           16        16            
  Lines          784       106   -678     
==========================================
- Hits           784       106   -678     

Impacted Files	Coverage Δ
src/pyextremes/models/distribution.py	100.00% <ø> (ø)
src/pyextremes/models/model_base.py	100.00% <ø> (ø)
src/pyextremes/models/model_emcee.py	100.00% <ø> (ø)
src/pyextremes/__init__.py	100.00% <100.00%> (ø)
src/pyextremes/eva.py	100.00% <100.00%> (ø)
src/pyextremes/extremes/block_maxima.py	100.00% <100.00%> (ø)
src/pyextremes/extremes/extremes.py	100.00% <100.00%> (ø)
src/pyextremes/extremes/peaks_over_threshold.py	100.00% <100.00%> (ø)
src/pyextremes/extremes/return_periods.py	100.00% <100.00%> (ø)
src/pyextremes/models/models.py	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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[georgebv]

Thank you!