fix error message with paired quotes

Summary: As titled, just update the `TypeError` messages, no logical changes.

Reviewed By: derolf

Differential Revision: D62136190

fbshipit-source-id: 3c9cdb25145055afe2733a66052579ffdab20c95

folly/json/dynamic.cpp

@@ -50,14 +50,14 @@ const char* dynamic::typeName() const {
 
 TypeError::TypeError(const std::string& expected, dynamic::Type actual)
     : std::runtime_error(sformat(
-          "TypeError: expected dynamic type `{}', but had type `{}'",
+          "TypeError: expected dynamic type '{}', but had type '{}'",
           expected,
           dynamic::typeName(actual))) {}
 
 TypeError::TypeError(
     const std::string& expected, dynamic::Type actual1, dynamic::Type actual2)
     : std::runtime_error(sformat(
-          "TypeError: expected dynamic types `{}, but had types `{}' and `{}'",
+          "TypeError: expected dynamic types '{}', but had types '{}' and '{}'",
           expected,
           dynamic::typeName(actual1),
           dynamic::typeName(actual2))) {}