Format C++ code with clang-format 15

Author: dtolnay

book/src/binding/slice.md

@@ -24,7 +24,7 @@ public:
   Slice(T *, size_t count) noexcept;
 
   template <typename C>
-  explicit Slice(C& c) : Slice(c.data(), c.size());
+  explicit Slice(C &c) : Slice(c.data(), c.size());
 
   Slice &operator=(Slice<T> &&) noexcept;
   Slice &operator=(const Slice<T> &) noexcept

include/cxx.h

@@ -177,7 +177,7 @@ class Slice final
   Slice(T *, std::size_t count) noexcept;
 
   template <typename C>
-  explicit Slice(C& c) : Slice(c.data(), c.size()) {}
+  explicit Slice(C &c) : Slice(c.data(), c.size()) {}
 
   Slice &operator=(const Slice<T> &) &noexcept = default;
   Slice &operator=(Slice<T> &&) &noexcept = default;