bug#42432: 26.3; Doc of `browse-url*' functions

[Drew Adams]

The doc of the `browse-url*' functions that says that the function uses
a WWW browser is, in general, incorrect when it comes to functions that
can browse a file.  The doc should be corrected in this regard.

For example, any function that directly or indirectly uses
`browse-url-default-windows-browser' does NOT, even in general, use a
web browser.  It typically uses `w32-shell-execute' with action "open"
to open the file.  In general, the program that does that is determined
by the file type, and in generalt it is NOT a web browser.


In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor `Microsoft Corp.', version 10.0.18362
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''