Frontend: fix comment typos

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149495 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Frontend/FrontendAction.h b/include/clang/Frontend/FrontendAction.h
index 041c1d3..80d0d5f 100644
--- a/include/clang/Frontend/FrontendAction.h
+++ b/include/clang/Frontend/FrontendAction.h
@@ -85,7 +85,7 @@
 
   /// EndSourceFileAction - Callback at the end of processing a single input;
   /// this is guaranteed to only be called following a successful call to
-  /// BeginSourceFileAction (and BeingSourceFile).
+  /// BeginSourceFileAction (and BeginSourceFile).
   virtual void EndSourceFileAction() {}
 
   /// @}
@@ -183,8 +183,8 @@
   /// automatically be shared with the AST file in between \see
   /// BeginSourceFile() and \see EndSourceFile().
   ///
-  /// \return True on success; the compilation of this file should be aborted
-  /// and neither Execute nor EndSourceFile should be called.
+  /// \return True on success; on failure the compilation of this file should
+  /// be aborted and neither Execute nor EndSourceFile should be called.
   bool BeginSourceFile(CompilerInstance &CI, const FrontendInputFile &Input);
 
   /// Execute - Set the source managers main input file, and run the action.