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/src/gd.h b/src/gd.h
index 51b9661..b033238 100644
--- a/src/gd.h
+++ b/src/gd.h
@@ -406,7 +406,7 @@ typedef double (* interpolation_method )(double, double);
      <Accessor Macros>
 
    (Previous versions of this library encouraged directly manipulating
-   the contents ofthe struct but we are attempting to move away from
+   the contents of the struct but we are attempting to move away from
    this practice so the fields are no longer documented here.  If you
    need to poke at the internals of this struct, feel free to look at
    *gd.h*.)