[clang-format] Add TextProto language name, NFC

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@307264 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Format/Format.h

@@ -1753,6 +1753,8 @@ inline StringRef getLanguageName(FormatStyle::LanguageKind Language) {
     return "JavaScript";
   case FormatStyle::LK_Proto:
     return "Proto";
+  case FormatStyle::LK_TextProto:
+    return "TextProto";
   default:
     return "Unknown";
   }