fixup! WIP: posts: add mutiple-dispatch-in-c++

content/posts/2022-06-07-multiple-dispatch-in-c++/index.md

@@ -96,7 +96,7 @@ For example, a dummy file-system interface might look like the following:
 ```cpp
 struct Filesystem {
     virtual void write(std::string_view filename, std::span<char> data) = 0;
-    virtual std::vector read(std::string_view filename) = 0;
+    virtual std::vector<char> read(std::string_view filename) = 0;
     virtual void delete(std::string_view filename) = 0;
 };
 ```