Fix docblock spelliong error

[NiklasBr]

Resolves #391

[codecov-commenter]

Codecov Report

Merging #392 (165726c) into main (cf8a66c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #392   +/-   ##
=======================================
  Coverage   72.80%   72.80%           
=======================================
  Files         125      125           
  Lines       22959    22959           
=======================================
  Hits        16716    16716           
  Misses       6243     6243           

Flag	Coverage Δ
php-5.3-ubuntu-latest	72.28% <ø> (ø)
php-5.6-ubuntu-latest	45.15% <ø> (+<0.01%)	⬆️
php-7.1-ubuntu-latest	45.69% <ø> (+<0.01%)	⬆️
php-7.2-ubuntu-latest	45.64% <ø> (ø)
php-7.3-ubuntu-latest	45.63% <ø> (+<0.01%)	⬆️
php-7.4-ubuntu-latest	45.63% <ø> (+<0.01%)	⬆️
php-8.0-ubuntu-latest	65.19% <ø> (ø)

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Impacted Files	Coverage Δ
tcpdf.php	70.93% <ø> (ø)

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[NiklasBr]

Failing tests appear to have no relation to this change.

[williamdes]

Failing tests appear to have no relation to this change.

Indeed, they will be fixed by #356