Remove duplicated comment.

Found by -Wdocumentation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182402 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/DIBuilder.h b/include/llvm/DIBuilder.h
index 1fa7bc1..906e9d4 100644
--- a/include/llvm/DIBuilder.h
+++ b/include/llvm/DIBuilder.h
@@ -588,7 +588,6 @@
                                           unsigned Line, StringRef Name);
 
     /// \brief Create a descriptor for an imported function.
-    /// \brief Create a descriptor for an imported function.
     /// @param Context The scope this module is imported into
     /// @param Decl The declaration (or definition) of a function, type, or
     ///             variable