Misprint in "Restcomm USSD GateWay"

[kifir239]

https://www.restcomm.com/docs/core/ussd/USSD_Gateway_Admin_Guide.html contains the following misprints:

• redundant "n": in "In case of USSD PULL if Application sennds back non OK (200) response"
• redundant "s": in "Error message shown to user when request timesout."