sample subpackage.sh: TERMUX_SUBPKG_INCLUDE should be under description and dep fields

Some subpackages may have long include lists (e.g. ncurses-utils) so it worth to have
description and dependencies specified on top for better visibility.

docs/sample/subpackage.sh

@@ -3,10 +3,10 @@
 # Unless otherwise specified, variables are optional.
 # Default values of all variables are found in build-package.sh
 
-TERMUX_SUBPKG_INCLUDE= # REQUIRED. Files to be included in subpackage.
 TERMUX_SUBPKG_DESCRIPTION= # REQUIRED. Subpackage description.
 TERMUX_SUBPKG_DEPENDS= # Subpackage dependencies.
 TERMUX_SUBPKG_CONFLICTS= # Conflicted subpackages.
 TERMUX_SUBPKG_REPLACES= # Replaced packages.
 TERMUX_SUBPKG_PLATFORM_INDEPENDENT= # Whether subpackage is cross-platform.
+TERMUX_SUBPKG_INCLUDE= # REQUIRED. Files to be included in subpackage.
 TERMUX_SUBPKG_CONFFILES= # Subpackage configuration files.