API: Convexity typo, typos

[martinfleis]

Fixed typos across docstrings.

Includes API change Convexeity -> Convexity. Since we're still in early dev phases, it is a hard breaking change without deprecation.

[codecov]

Codecov Report

Merging #171 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #171   +/-   ##
=======================================
  Coverage   94.06%   94.06%           
=======================================
  Files          10       10           
  Lines        2630     2630           
=======================================
  Hits         2474     2474           
  Misses        156      156           

Impacted Files	Coverage Δ
momepy/dimension.py	97.48% <ø> (ø)
momepy/distribution.py	98.17% <ø> (ø)
momepy/diversity.py	94.95% <ø> (ø)
momepy/elements.py	92.08% <ø> (ø)
momepy/graph.py	97.10% <ø> (ø)
momepy/intensity.py	98.55% <ø> (ø)
momepy/utils.py	83.33% <ø> (ø)
momepy/weights.py	100.00% <ø> (ø)
momepy/shape.py	96.45% <100.00%> (ø)

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