Update composefile versions and quotes in examples
Update composefile versions and quotes in examples

Changed version from 2 to 3, updated quotation marks to match example, changed front and back to frontend and backend.
johnstep/docker.github.io,londoncalling/docker.github.io,bdwill/docker.github.io,joeuo/docker.github.io,johnstep/docker.github.io,JimGalasyn/docker.github.io,shin-/docker.github.io,thaJeztah/docker.github.io,phiroict/docker,londoncalling/docker.github.io,phiroict/docker,docker/docker.github.io,thaJeztah/docker.github.io,joeuo/docker.github.io,anweiss/docker.github.io,johnstep/docker.github.io,bdwill/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,shin-/docker.github.io,shubheksha/docker.github.io,joeuo/docker.github.io,johnstep/docker.github.io,JimGalasyn/docker.github.io,johnstep/docker.github.io,shubheksha/docker.github.io,JimGalasyn/docker.github.io,bdwill/docker.github.io,shubheksha/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,phiroict/docker,shubheksha/docker.github.io,thaJeztah/docker.github.io,joeuo/docker.github.io,londoncalling/docker.github.io,phiroict/docker,JimGalasyn/docker.github.io,shubheksha/docker.github.io,shin-/docker.github.io,shin-/docker.github.io,londoncalling/docker.github.io,docker/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,bdwill/docker.github.io,anweiss/docker.github.io,anweiss/docker.github.io,thaJeztah/docker.github.io,phiroict/docker,JimGalasyn/docker.github.io,bdwill/docker.github.io,joeuo/docker.github.io,shin-/docker.github.io