[locale.ctype.byname] Fix indentation (cplusplus#9024)

Author: Andreas-Krug

source/text.tex

@@ -1685,15 +1685,15 @@
 \begin{codeblock}
 namespace std {
   template<class charT>
-    class ctype_byname : public ctype<charT> {
-    public:
-      using @\libmember{mask}{ctype_byname}@ = ctype<charT>::mask;
-      explicit ctype_byname(const char*, size_t refs = 0);
-      explicit ctype_byname(const string&, size_t refs = 0);
+  class ctype_byname : public ctype<charT> {
+  public:
+    using @\libmember{mask}{ctype_byname}@ = ctype<charT>::mask;
+    explicit ctype_byname(const char*, size_t refs = 0);
+    explicit ctype_byname(const string&, size_t refs = 0);
 
-    protected:
-      ~ctype_byname();
-    };
+  protected:
+    ~ctype_byname();
+  };
 }
 \end{codeblock}