abuild: fix typo

abuild.in

@@ -1390,7 +1390,7 @@ usage() {
 	echo " -f  Force specified cmd, even if they are already done"
 	echo " -F  Force run as root"
 	echo " -h  Show this help"
-	echo " -i  Install PKG after successul build"
+	echo " -i  Install PKG after successful build"
 	echo " -k  Keep built packages, even if APKBUILD or sources are newer"
 	echo " -m  Disable colors (monochrome)"
 	echo " -p  Set package destination directory"