Update awslogs.md (#5816)
Update awslogs.md (#5816)

the [ and ] need to be escapped to avoid the folling docker error: 
docker: Error response from daemon: failed to initialize logging driver: awslogs could not parse multiline pattern key "[\\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[1,2][0-9]|3[0,1])T(?:[0,1][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]+00:00]": error parsing regexp: invalid character class range: `}-(`.
docker/docker.github.io,thaJeztah/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,johnstep/docker.github.io,JimGalasyn/docker.github.io,johnstep/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,johnstep/docker.github.io,docker/docker.github.io,johnstep/docker.github.io,londoncalling/docker.github.io,anweiss/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,JimGalasyn/docker.github.io,londoncalling/docker.github.io,anweiss/docker.github.io,johnstep/docker.github.io,thaJeztah/docker.github.io,anweiss/docker.github.io