Merge Tomáš Hnyk's 'Bug798624' into maint.

Author: jralls

manual/C/ch_Finance-Quote.xml

@@ -464,7 +464,8 @@ BEGIN failed--compilation aborted at (eval 303) line 1.
       &app;-data file without starting the GUI. Thus an automatic, regular updating of the price
       database is possible.
       <warning>
-        <para>Please note that the data file should not be open in another instance of &app; at the same time!
+        <para>The command will fail if it cannot get a lock on the data file, for examplle if the
+          data file is open in another GnuCash instance or if the last session for the file crashed.
         </para>
       </warning>
     </para>