Sync SDL3 wiki -> header

[ci skip]

include/SDL3/SDL_asyncio.h

@@ -67,14 +67,14 @@
  *
  * ## Best Practices
  *
- * Simple non-blocking i/o--for an app that just wants to pick up data
+ * Simple non-blocking I/O--for an app that just wants to pick up data
  * whenever it's ready without losing framerate waiting on disks to spin--can
  * use whatever pattern works well for the program. In this case, simply call
  * SDL_ReadAsyncIO, or maybe SDL_LoadFileAsync, as needed. Once a frame, call
  * SDL_GetAsyncIOResult to check for any completed tasks and deal with the
  * data as it arrives.
  *
- * If two separate pieces of the same program need their own i/o, it is legal
+ * If two separate pieces of the same program need their own I/O, it is legal
  * for each to create their own queue. This will prevent either piece from
  * accidentally consuming the other's completed tasks. Each queue does require
  * some amount of resources, but it is not an overwhelming cost. Do not make a
@@ -83,7 +83,7 @@
  * were submitted, so it doesn't generally matter what order tasks are
  * started.
  *
- * One async i/o queue can be shared by multiple threads, or one thread can
+ * One async I/O queue can be shared by multiple threads, or one thread can
  * have more than one queue, but the most efficient way--if ruthless
  * efficiency is the goal--is to have one queue per thread, with multiple
  * threads working in parallel, and attempt to keep each queue loaded with