Subject: say what browser shr-browse-url will use if not EXTERNAL

From: 積丹尼 Dan Jacobson <[email-masked]>
Date: Tue, 27 Mar 2018 09:24:20 +0800

shr-browse-url is an interactive compiled Lisp function in ‘shr.el’.

    (shr-browse-url &optional EXTERNAL MOUSE-EVENT)

    Browse the URL under point.
    If EXTERNAL, browse the URL using ‘shr-external-browser’.

Please add

    else browse the URL using browse-url.