Fix more errors associated with posix_spawn system calls

nshlib/nsh_console.c

@@ -487,5 +487,6 @@ FAR struct console_stdio_s *nsh_newconsole(void)
       pstate->cn_outstream       = OUTSTREAM(pstate);
 #endif
     }
+
   return pstate;
 }

nshlib/nsh_consolemain.c

@@ -94,7 +94,7 @@
  * Returned Values:
  *   This function does not normally return.  exit() is usually called to
  *   terminate the NSH session.  This function will return in the event of
- *   an error.  In that case, a nonzero value is returned (EXIT_FAILURE=1).
+ *   an error.  In that case, a non-zero value is returned (EXIT_FAILURE=1).
  *
  ****************************************************************************/