Rename arena free functions

mem/include/arena/mem_arena.h

@@ -17,7 +17,7 @@ void *wapp_mem_arena_realloc(Arena *arena, void *ptr, u64 size);
 void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 size,
                                      u64 alignment);
 void wapp_mem_arena_clear(Arena *arena);
-void wapp_mem_arena_free(Arena **arena);
+void wapp_mem_arena_destroy(Arena **arena);
 
 #ifdef __cplusplus
 }