vk_texture_cache: Fix typo in commentary

Co-Authored-By: MysticExile <30736337+MysticExile@users.noreply.github.com>

src/video_core/renderer_vulkan/vk_texture_cache.cpp

@@ -229,7 +229,7 @@ void CachedSurface::DownloadTexture(std::vector<u8>& staging_buffer) {
     }
     scheduler.Finish();
 
-    // TODO(Rodrigo): Use an intern buffer for staging buffers and avoid this unnecesary memcpy.
+    // TODO(Rodrigo): Use an intern buffer for staging buffers and avoid this unnecessary memcpy.
     std::memcpy(staging_buffer.data(), buffer.commit->Map(host_memory_size), host_memory_size);
 }