Use correct HTML character reference for em dash (#5917)
Use correct HTML character reference for em dash (#5917)

Minor typo in the docs - `&#8212;` should be used for an [em dash](https://en.wikipedia.org/wiki/Dash#Common_dashes), not `&8212;`.
docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,johnstep/docker.github.io,JimGalasyn/docker.github.io,JimGalasyn/docker.github.io,londoncalling/docker.github.io,anweiss/docker.github.io,JimGalasyn/docker.github.io,thaJeztah/docker.github.io,johnstep/docker.github.io,londoncalling/docker.github.io,anweiss/docker.github.io,johnstep/docker.github.io,johnstep/docker.github.io,johnstep/docker.github.io,anweiss/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,JimGalasyn/docker.github.io,anweiss/docker.github.io