For nearly all commands in U-Boot the '?' variable is handled the same
way with 0 meaning success, 1 meaning any failure.  Explain this in the
general rules section of the cmdline documentation (with a link to a
counter example) and then remove the redundant wording from most
commands. We retain a section about the return value in a number of
places where we are doing something such as always returning a specific
value or we have useful additional information to go along with the
normal return codes.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

Add fuse writebuff sub-system command documentation.

Signed-off-by: Harsha Vardhan V M <h-vm@ti.com>

Add documentation for the 'fuse' sub-system commands in
doc/usage/cmd/fuse.rst file.
Remove doc/README.fuse file.

Signed-off-by: Harsha Vardhan V M <h-vm@ti.com>