Ask a text browser to load URL.
URL defaults to the URL around or before point.
This runs the text browser specified by `browse-url-text-browser'.
With a prefix argument, it runs a new browser process in a new buffer.
When called interactively, if variable `browse-url-new-window-flag' is
non-nil, load the document in a new browser process in a new term window,
otherwise use any existing one. A non-nil interactive prefix argument
reverses the effect of `browse-url-new-window-flag'.
When called non-interactively, optional second argument NEW-WINDOW is
used instead of `browse-url-new-window-flag'.
(fn URL &optional NEW-BUFFER)