fix typo

debian/aegir-provision.postinst

@@ -47,7 +47,7 @@ case "$1" in
         if ! [ -z "$sedscript" ]; then
             sed -e "$sedscript" /usr/share/doc/aegir-provision/examples/example.sudoers >> $TEMPFILE
         else
-            # this should happend, but still handle gracefully
+            # this shouldn't happen, but still handle gracefully
             cp /usr/share/doc/aegir-provision/examples/examples.sudoers $TEMPFILE
         fi