Fixed simple typos

[creyD]

Description

This PR fixes simple typos in the docs and removes unused imports

How Has This Been Tested?

Just the docs, so no testing needed

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #996 (05f9958) into master (6325659) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #996      +/-   ##
==========================================
- Coverage   97.65%   97.65%   -0.01%     
==========================================
  Files          23       23              
  Lines        1151     1149       -2     
  Branches      222      222              
==========================================
- Hits         1124     1122       -2     
  Misses         12       12              
  Partials       15       15              

Impacted Files	Coverage Δ
simple_history/utils.py	100.00% <ø> (ø)

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