Update BUGS

Co-Authored-By: Matthias Kuhn <[email protected]>

Author: jgrocha

BUGS

@@ -1,7 +1,7 @@
 Help I think I found a bug!
 ---------------------------
 
-If you find a bug in QGIS, first check if it has been reported:
+If you find a bug in QGIS, first check if it has already been reported:
 
 https://github.com/qgis/QGIS/issues