Typo fixes

[PabloAlexis611]

Some easy typo fixes (found thanks to the codespell library)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 46.87%. Comparing base (26635ef) to head (3bd1eff).
Report is 25 commits behind head on master.

Files	Patch %	Lines
src/rinoh/backend/pdf/xobject/purepng.py	0.00%	2 Missing ⚠️
src/rinoh/backend/pdf/reader.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (26635ef) and HEAD (3bd1eff). Click for more details.

HEAD has 14 uploads less than BASE

Flag	BASE (26635ef)	HEAD (3bd1eff)
3.10	2	1
Linux	9	5
3.11	2	1
regression-3.10	1	0
3.12.0-alpha	2	1
regression-3.11	1	0
3.8	2	1
regression-3.8	1	0
regression-3.12	1	0
pypy-3.9	2	1
regression-pypy3	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #427       +/-   ##
===========================================
- Coverage   77.23%   46.87%   -30.37%     
===========================================
  Files          93       93               
  Lines       14690    14690               
  Branches     2416     2416               
===========================================
- Hits        11346     6886     -4460     
- Misses       2906     7633     +4727     
+ Partials      438      171      -267     

Flag	Coverage Δ
3.10	46.89% <0.00%> (-30.36%)	⬇️
3.11	46.89% <0.00%> (-30.37%)	⬇️
3.12.0-alpha	46.89% <0.00%> (-30.37%)	⬇️
3.8	46.88% <0.00%> (-30.32%)	⬇️
3.9	46.88% <0.00%> (ø)
Linux	46.87% <0.00%> (-30.36%)	⬇️
pypy-3.9	46.90% <0.00%> (-30.33%)	⬇️
regression-3.10	?
regression-3.11	?
regression-3.12	?
regression-3.8	?
regression-pypy3	?
unit-3.10	46.89% <0.00%> (ø)
unit-3.11	46.89% <0.00%> (ø)
unit-3.12	46.89% <0.00%> (ø)
unit-3.8	46.88% <0.00%> (ø)
unit-3.9	46.88% <0.00%> (ø)
unit-pypy3	46.90% <0.00%> (ø)

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