Small editorial change to the Feature Extension spec text.
Small editorial change to the Feature Extension spec text.

Signed-off-by: David Bosschaert <b299ec9357646ec2b4cddc0888c86a0c494087ef@adobe.com>

osgi/osgi,osgi/osgi,osgi/osgi,osgi/osgi,osgi/osgi,osgi/osgi,osgi/osgi,osgi/osgi