Fix FlutterPresentInfo struct_size doc string (#29524)

Author: iskakaushik

shell/platform/embedder/embedder.h

@@ -372,7 +372,7 @@ typedef uint32_t (*UIntFrameInfoCallback)(
 ///
 /// See: \ref FlutterOpenGLRendererConfig.present_with_info.
 typedef struct {
- /// The size of this struct. Must be sizeof(FlutterFrameInfo).
+ /// The size of this struct. Must be sizeof(FlutterPresentInfo).
  size_t struct_size;
  /// Id of the fbo backing the surface that was presented.
  uint32_t fbo_id;