docs: Fix a few typos

There are small typos in:
- examples/copyrotated.c
- src/gd.c
- src/gd.h
- src/gd_avif.c
- src/gd_nnquant.c
- src/gd_tga.c
- src/gd_topal.c
- src/wbmp.c
- tests/avif/compare_avif_to_png.c

Fixes:
- Should read `requires` rather than `reqiures`.
- Should read `of the` rather than `ofthe`.
- Should read `memory` rather than `memmory`.
- Should read `maximum` rather than `maxmum`.
- Should read `intersection` rather than `intertersection`.
- Should read `hypotenuse` rather than `hypothenus`.
- Should read `flexibility` rather than `flexibilty`.
- Should read `always` rather than `alwasy`.
- Should read `also` rather than `alos`.

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