doc/manuals: fix s/There/The/ in 'USSD Configuration'

Change-Id: Idbff93b6be5f546f18642ee330746e8734378b39
diff --git a/doc/manuals/chapters/ussd.adoc b/doc/manuals/chapters/ussd.adoc
index be463ac..1d962b7 100644
--- a/doc/manuals/chapters/ussd.adoc
+++ b/doc/manuals/chapters/ussd.adoc
@@ -50,7 +50,7 @@
 routed to the named EUSE.
 
 `ussd route prefix *#100# internal own-msisdn` installs a prefix route
-to the named internal USSD handler.  There above command will restore
+to the named internal USSD handler.  The above command will restore
 the old behavior, in which *#100# will return a text message containing
 the subscribers own phone number.  There is one other handler called
 `own-imsi` which will return the IMSI instead of the MSISDN.