org-agenda.el (org-agenda-to-appt): Fix typos

* org-agenda.el (org-agenda-to-appt): Fix typos.

Thanks to Sean Allred for reporting this.

lisp/org-agenda.el

@@ -9517,7 +9517,7 @@ By default `org-agenda-to-appt' will use :deadline, :scheduled
 and :timestamp entries.  See the docstring of `org-diary' for
 details and examples.
 
-If an entry as a APPT_WARNTIME property, its value will be used
+If an entry has a APPT_WARNTIME property, its value will be used
 to override `appt-message-warning-time'."
   (interactive "P")
   (if refresh (setq appt-time-msg-list nil))
@@ -9606,7 +9606,7 @@ By default `org-agenda-to-appt' will use :deadline, :scheduled
 and :timestamp entries.  See the docstring of `org-diary' for
 details and examples.
 
-If an entry as a APPT_WARNTIME property, its value will be used
+If an entry has a APPT_WARNTIME property, its value will be used
 to override `appt-message-warning-time'.
 
 \(fn &optional REFRESH FILTER &rest ARGS)" t nil)