Document how to connect the Timer block BRK_IN to a physical Pin alternate
function.
Add an example of PWM Motor drive using complementary outputs with dead
time and break input to kill the PWM and generate a callback.
Signed-off-by: Chris Mason <c.mason@inchipdesign.com.au>
Latest versions of Sphinx (at least 3.1.0) do not need the `*` escaped and
will render the `\` in the output if it is there, so remove it.
Fixes issue #6209.
By virtue of its name, the pyb module would only be available on a pyboard
and so does not need to have conditional "only" directives throughout its
documentation.
These conditionals were added mostly in
cfcf47c0644952358e1a260db159e807872a37e6 in the initial development of the
cc3200 port, which had the pyb module before it switched to the machine
module. And wipy only conditionals were removed from the pyb module
documentation in 4542643025c77a7272bde348b89d5039aea28d23, so there's no
need to retain any more conditionals.
