Fix a comment typo.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@123184 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
index a76a574..24fc45f 100644
--- a/lib/AST/Decl.cpp
+++ b/lib/AST/Decl.cpp
@@ -1411,7 +1411,7 @@
 
 
 /// getNumParams - Return the number of parameters this function must have
-/// based on its FunctionType.  This is the length of the PararmInfo array
+/// based on its FunctionType.  This is the length of the ParamInfo array
 /// after it has been created.
 unsigned FunctionDecl::getNumParams() const {
   const FunctionType *FT = getType()->getAs<FunctionType>();