[310] typo fixup

tip-of-the-week · Jan 17, 2023 · f930584 · f930584
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commit f930584
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diff --git a/tips/310.md b/tips/310.md
@@ -59,6 +59,7 @@ template<>
 
 > https://godbolt.org/z/eTWasjTTr
 
+```cpp
 [[nodiscard]] constexpr auto to_string_view()
 {
     constexpr static std::size_t N = sizeof...(Cs);