doc: update cactbot-highlight url (#1876)
doc: update cactbot-highlight url (#1876)

cactbot-highlight is now available on Visual Studio Market,
so update the URL
quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot