[clang-tidy][NFC] Fix typo.

Fix placement of comma from previous (test) commit.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@353525 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/clang-tidy/readability/ConstReturnTypeCheck.cpp b/clang-tidy/readability/ConstReturnTypeCheck.cpp
index a6fccd2..0f237ec 100644
--- a/clang-tidy/readability/ConstReturnTypeCheck.cpp
+++ b/clang-tidy/readability/ConstReturnTypeCheck.cpp
@@ -22,7 +22,7 @@
 // Finds the location of the qualifying `const` token in the `FunctionDecl`'s
 // return type. Returns `None` when the return type is not `const`-qualified or
-// `const` does not appear in `Def`'s source like, when the type is an alias or
+// `const` does not appear in `Def`'s source, like when the type is an alias or
 // a macro.
 static llvm::Optional<Token>
 findConstToRemove(const FunctionDecl *Def,