Fixed types used in documentation (thanks @Dragon-Baroque!)

docs/README-dynapi.md

@@ -35,7 +35,7 @@ SDL now has, internally, a table of function pointers. So, this is what SDL_Init
 now looks like:
 
 ```c
-UInt32 SDL_Init(Uint32 flags)
+Uint32 SDL_Init(Uint32 flags)
 {
     return jump_table.SDL_Init(flags);
 }
@@ -100,7 +100,7 @@ a shared library of its own). If so, it loads that library and looks for and
 calls a single function:
 
 ```c
-SInt32 SDL_DYNAPI_entry(Uint32 version, void *table, Uint32 tablesize);
+Sint32 SDL_DYNAPI_entry(Uint32 version, void *table, Uint32 tablesize);
 ```
 
 That function takes a version number (more on that in a moment), the address of