Spelling fix in inter.phone

[Ilya Kaliman]

The correct spelling is St. Petersburg:

RCS file: /cvs/src/share/misc/inter.phone,v
retrieving revision 1.41
diff -u -p -r1.41 inter.phone
--- inter.phone 7 Feb 2015 23:49:00 -0000       1.41
+++ inter.phone 9 Jul 2016 17:43:58 -0000
@@ -6,7 +6,7 @@
 1:510:Berkeley:USA
 7:495:Moscow:Russia
 7:3832:Novosibirsk:Russia
-7:812:St. Peterburg:Russia
+7:812:St. Petersburg:Russia
 7:::Kazakhstan
 20:2:Cairo:Egypt, Arab Rep. of
 20:3:Alexandria:Egypt, Arab Rep. of