Document that '.' stops repetition of 's..." sequences.
Document that '.' stops repetition of 's..." sequences.

This is useful in order to get visual indication that something did
not succeed:

	# Give it 5 seconds to run
	echo 'sjjjjjA.' > /dev/led/error
	random_program
	echo '0' > /dev/led/error

If random_program takes more than 5 seconds or if it hangs, the LED
will be turned on.

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