Fix typos

[woxtu]

Hi,

This PR fixes typos in the code.

[philprime]

Thank you for your contribution!

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (196e32e) 78.86% compared to head (72b9046) 78.86%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #338   +/-   ##
=======================================
  Coverage   78.86%   78.86%           
=======================================
  Files         212      212           
  Lines       12608    12608           
=======================================
  Hits         9943     9943           
  Misses       2665     2665           

Flag	Coverage Δ
iOS	79.78% <100.00%> (ø)
macOS	0.00% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Source/API/Groups/PDFGroupContainer.swift	0.00% <ø> (ø)
Source/API/Layout/PDFContainer.swift	92.85% <ø> (ø)
Source/API/PDFGeneratorProtocol.swift	100.00% <ø> (ø)
Source/API/PDFMultiDocumentGenerator.swift	0.00% <ø> (ø)
Source/API/Text/PDFSimpleText.swift	70.00% <ø> (ø)
Source/API/Text/PDFTextStyle.swift	22.72% <ø> (ø)
Source/Internal/Image/PDFImageObject.swift	4.65% <ø> (ø)
Source/Internal/Layout/PDFLayoutHeights.swift	70.21% <ø> (ø)
...ce/Internal/Layout/PDFSectionColumnContainer.swift	0.00% <ø> (ø)
Source/Internal/Text/PDFAttributedTextObject.swift	78.57% <ø> (ø)
... and 16 more

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