Address PR comments.

Author: chinmaygarde

shell/platform/embedder/embedder.h

@@ -969,9 +969,9 @@ typedef struct {
 ///             cases where the embedder specifies custom task runners via
 ///             `FlutterProjectArgs::custom_task_runners`. In such cases, the
 ///             engine may need the embedder to post tasks back to it before
-///             `FluterEngineRun` has returned. Embedders can only post tasks to
-///             the engine if they have a handle to the engine. In such cases,
-///             embedders are advised to get the engine handle via the
+///             `FlutterEngineRun` has returned. Embedders can only post tasks
+///             to the engine if they have a handle to the engine. In such
+///             cases, embedders are advised to get the engine handle via the
 ///             `FlutterInitializeCall`. Then they can call
 ///             `FlutterEngineRunInitialized` knowing that they will be able to
 ///             service custom tasks on other threads with the engine handle.
@@ -995,7 +995,7 @@ FlutterEngineResult FlutterEngineRun(size_t version,
                                          engine_out);
 
 //------------------------------------------------------------------------------
-/// @brief      Shuts down a Flutter engine Tnstance. the engine handle is no
+/// @brief      Shuts down a Flutter engine instance. the engine handle is no
 ///             longer valid for any calls in the embedder API after this point.
 ///             Making additional calls with this handle is undefined behavior.
 ///
@@ -1059,11 +1059,11 @@ FlutterEngineResult FlutterEngineDeinitialize(FLUTTER_API_SYMBOL(FlutterEngine)
 ///             custom task runners supplied by the embedder are expected to
 ///             start servicing tasks.
 ///
-/// @param[in]  engine  A initialized engine instance that has not previously
+/// @param[in]  engine  An initialized engine instance that has not previously
 ///                     been run.
 ///
-/// @return     The result of the call to run the initialized the Flutter
-///             engine.
+/// @return     The result of the call to run the initialized Flutter
+///             engine instance.
 ///
 FLUTTER_EXPORT
 FlutterEngineResult FlutterEngineRunInitialized(