[docs] fix html highlighting for ecs doc
[docs] fix html highlighting for ecs doc

dmarcos/aframe,wizgrav/aframe,aframevr/aframe,jaxmolina/ar,RSpace/aframe,googlecreativelab/aframe,RSpace/aframe,mkungla/aframe,chenzlabs/aframe,darkwing/aframe,mkungla/aframe,jaxmolina/ar,googlecreativelab/aframe,ngokevin/aframe,wizgrav/aframe,chenzlabs/aframe,ngokevin/aframe,darkwing/aframe,dmarcos/aframe,weddingdj/aframe,weddingdj/aframe,aframevr/aframe