Update examples

Author: zxh0

example/protos/v3/issue42.proto

@@ -2,9 +2,5 @@ syntax = "proto3";
 package example;
 
 message Msg42a {
-  bytes test = 1[default="aaaa \" dddd"];
-}
-
-message Msg42b {
-
+  bytes test = 1 [default="aaaa \" dddd"];
 }

example/protos/v3/options.proto

@@ -20,6 +20,10 @@ message TestOptions {
   int64 y = 8 [ jstype=JS_STRING ];
   int64 z = 9 [lazy=false];
   string s = 100 [deprecated=true, lazy=false];
+
+  string s1 = 200 [default="abc'def\"g"];
+  string s2 = 201 [default='abc"def\'g'];
+  string str_escapes = 202 [default="abc\xa1\xB2\123\a\b\f\n\r\t\v"];
 }
 
 enum TestEnum {