LibCore: Convert String::format() => String::formatted()

Userland/Libraries/LibCore/ArgsParser.h

@@ -53,8 +53,8 @@ public:
         String name_for_display() const
         {
             if (long_name)
-                return String::format("--%s", long_name);
-            return String::format("-%c", short_name);
+                return String::formatted("--{}", long_name);
+            return String::formatted("-{:c}", short_name);
         }
     };
 

Userland/Libraries/LibCore/SocketAddress.h

@@ -74,7 +74,7 @@ public:
     {
         switch (m_type) {
         case Type::IPv4:
-            return String::format("%s:%d", m_ipv4_address.to_string().characters(), m_port);
+            return String::formatted("{}:{}", m_ipv4_address, m_port);
         case Type::Local:
             return m_local_address;
         default: