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`.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/avif/compare_avif_to_png.c b/tests/avif/compare_avif_to_png.c
index 50a8041..7a188b5 100644
--- a/tests/avif/compare_avif_to_png.c
+++ b/tests/avif/compare_avif_to_png.c
@@ -2,7 +2,7 @@
  * File: compare_avif_to_png
  *
  * Thorough check for AVIF encoding and decoding.
- * This test reqiures a set of PNG images that have been losslessly encoded to AVIFs.
+ * This test requires a set of PNG images that have been losslessly encoded to AVIFs.
  * For each such image, we encode the PNG into an AVIF, with the GD format as an intermediary,
  * then compare the resulting AVIF with the original PNG.
  *