Fix minor typos in the docs

[alex-kennedy]

Fixes a few minor typos (spelling mistakes and a formatting problem) in the documentation.

[codecov-io]

Codecov Report

Merging #802 (3342199) into main (1559aef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #802   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
=======================================
  Files          18       18           
  Lines        1837     1837           
  Branches      362      362           
=======================================
  Hits         1762     1762           
  Misses         37       37           
  Partials       38       38           

Impacted Files	Coverage Δ
tsfresh/convenience/relevant_extraction.py	95.65% <ø> (ø)
tsfresh/feature_extraction/feature_calculators.py	97.27% <ø> (ø)
tsfresh/feature_selection/relevance.py	95.28% <ø> (ø)
tsfresh/feature_selection/selection.py	90.00% <ø> (ø)
tsfresh/transformers/feature_selector.py	98.14% <ø> (ø)
tsfresh/transformers/relevant_feature_augmenter.py	94.87% <ø> (ø)
tsfresh/utilities/dataframe_functions.py	96.77% <ø> (ø)
tsfresh/utilities/distribution.py	90.82% <ø> (ø)

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[nils-braun]

Perfect! Thank you very much!