Fix spelling I ran over while proof-reading tests.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169271 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/ASTMatchers/ASTMatchersTest.cpp

@@ -1040,7 +1040,7 @@ TEST(Matcher, VariableUsage) {
       "}", Reference));
 }
 
-TEST(Matcher, FindsVarDeclInFuncitonParameter) {
+TEST(Matcher, FindsVarDeclInFunctionParameter) {
   EXPECT_TRUE(matches(
       "void f(int i) {}",
       varDecl(hasName("i"))));