Add documentation of lmeds functions #134

Job	Run time
osx	6m 5s
doc	5m 47s
catkin	6m 34s
linux (ubuntu:trusty)	5m 36s
linux (ubuntu:xenial)	7m 54s
linux (ubuntu:bionic)	6m 52s
linux (ubuntu:bionic, PQP)	6m 36s
linux (ubuntu:bionic, BULLET)	6m 49s
linux (ubuntu:focal)	7m 4s
linux (debian:stretch)	6m 51s
linux (osrf/ubuntu_armhf:trusty)	44m 3s
linux (osrf/ubuntu_armhf:xenial)	57m 59s
linux (osrf/ubuntu_arm64:trusty)	55m 5s
linux (osrf/ubuntu_arm64:xenial)	57m 43s
linux (arm64v8/ubuntu:bionic)	26m 14s
linux (arm64v8/ubuntu:focal)	42m 35s
linux (osrf/debian_arm64:stretch)	49m 50s
	6h 39m 37s

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