agl-service-windowmanager does not have valid documentation in markdown (including APIs/verbs)

https://git.automotivelinux.org/apps/agl-service-windowmanager/tree/doc/ApplicationGuide.md?h=flounder

is not valid markdown  (div id and such)

Should also only use "#" or "##" or "###" for headings  (not ** or ----------------)

Check with http://dillinger.io .