Issue #5067: improve some json error messages.
Patch by Serhiy Storchaka.
diff --git a/Doc/library/json.rst b/Doc/library/json.rst
index c2242d5..d54194a 100644
--- a/Doc/library/json.rst
+++ b/Doc/library/json.rst
@@ -99,8 +99,8 @@
     {
         "json": "obj"
     }
-    $ echo '{ 1.2:3.4}' | python -mjson.tool
-    Expecting property name: line 1 column 2 (char 2)
+    $ echo '{1.2:3.4}' | python -mjson.tool
+    Expecting property name enclosed in double quotes: line 1 column 1 (char 1)
 
 .. highlight:: python