restore necessary comman in documentation of dump

src/json.hpp

@@ -9056,7 +9056,7 @@ class basic_json
     @complexity Linear.
 
     @liveexample{The following example shows the effect of different @a indent
-    parameters to the result of the serialization.dump}
+    parameters to the result of the serialization.,dump}
 
     @see https://docs.python.org/2/library/json.html#json.dump