Update online help to describe deldays options accounting for DELDATE

User records (aka slots) will be preserved this many days since the user was
deleted (if the DELDATE field is non-zero) otherwise, days since last user
activity.

src/sbbs3/scfg/scfgsys.c

@@ -849,14 +849,14 @@ void security_cfg(void)
 			case __COUNTER__:
 				sprintf(str, "%u", cfg.sys_deldays);
 				uifc.helpbuf =
-					"`Days Since Last Logon to Preserve Deleted Users:`\n"
+					"`Days to Preserve Deleted Users:`\n"
 					"\n"
-					"Deleted user slots can be `undeleted` until the slot is written over\n"
-					"by a new user. If you want deleted user slots to be preserved for period\n"
-					"of time since their last logon, set this value to the number of days to\n"
+					"Deleted user records can be `undeleted` until the slot is over-written\n"
+					"by a new user.  If you want deleted user records to be preserved for a\n"
+					"period of time after deletion, set this value to the number of days to\n"
 					"keep new users from taking over a deleted user's slot.\n"
 				;
-				uifc.input(WIN_MID | WIN_SAV, 0, 0, "Days Since Last Logon to Preserve Deleted Users"
+				uifc.input(WIN_MID | WIN_SAV, 0, 0, "Days to Preserve Deleted Users"
 				           , str, 5, K_EDIT | K_NUMBER);
 				cfg.sys_deldays = atoi(str);
 				break;