Last of the spelling fixed

cde/lib/tt/lib/util/tt_audit.C

@@ -506,7 +506,7 @@ entry(const char *argskey, _Tt_entry_pt func, ...)
 			} break;
 
 			// this is an index for a particular argument
-			// We have a seperate case for this in order to
+			// We have a separate case for this in order to
 			// factor out the test below.
 			case ARG_INTEGER: {
 				int arg_index;