ext tester manpage fix

doc/mojitos_tester.pre.1

@@ -42,9 +42,11 @@ typedef void(*TesterInit)(void **state, void *context);
 typedef void(*TesterReader)(void *state, void *context, const char *buffer, int read_size);
 typedef int(*TesterFinalizer)(void *state, void *context);
 .Ed
-.Pp
+.Pp 
 The TesterInit function of a Tester is called once before mojitos is ran. It is given a pointer pointer to the state pointer, that will then be passed directly to the two other functions.  
+.Pp 
 The TesterReader function of a Tester is called everytime mojitos outputs something. It is given a pointer to the null-terminated string that was read on mojitos output.  
+.Pp 
 The TesterFinalizer function of a Tester is called once mojitos exits, and should return a non-zero value if the test failed (incorrect mojitos output), or 0 otherwise.  
 .Pp
 Notice how every function is also give a *context pointer. This pointer is the context property of the current Execution.