Make DTR install on UCP node requirement clearer
Make DTR install on UCP node requirement clearer

During DockerCon workshops and other customer sessions several people have noted that it is not clear that DTR must be installed on a node already joined to the UCP cluster (they asked if it automatically joined the UCP cluster or not). Adding two lines (one in install and one in replica joins) that hopefully makes this clearer.
BSWANG/denverdino.github.io,alexisbellido/docker.github.io,joaofnfernandes/docker.github.io,troy0820/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io,docker-zh/docker.github.io,shin-/docker.github.io,bdwill/docker.github.io,thaJeztah/docker.github.io,gdevillele/docker.github.io,rillig/docker.github.io,docker-zh/docker.github.io,alexisbellido/docker.github.io,phiroict/docker,jzwlqx/denverdino.github.io,jzwlqx/denverdino.github.io,shubheksha/docker.github.io,BSWANG/denverdino.github.io,joeuo/docker.github.io,jzwlqx/denverdino.github.io,denverdino/denverdino.github.io,shin-/docker.github.io,londoncalling/docker.github.io,denverdino/docker.github.io,docker/docker.github.io,jzwlqx/denverdino.github.io,menglingwei/denverdino.github.io,denverdino/denverdino.github.io,JimGalasyn/docker.github.io,joeuo/docker.github.io,joeuo/docker.github.io,aduermael/docker.github.io,LuisBosquez/docker.github.io,menglingwei/denverdino.github.io,docker/docker.github.io,menglingwei/denverdino.github.io,bdwill/docker.github.io,JimGalasyn/docker.github.io,troy0820/docker.github.io,shin-/docker.github.io,anweiss/docker.github.io,joaofnfernandes/docker.github.io,thaJeztah/docker.github.io,denverdino/denverdino.github.io,troy0820/docker.github.io,JimGalasyn/docker.github.io,BSWANG/denverdino.github.io,gdevillele/docker.github.io,menglingwei/denverdino.github.io,sanscontext/docker.github.io,phiroict/docker,shubheksha/docker.github.io,sanscontext/docker.github.io,docker-zh/docker.github.io,alexisbellido/docker.github.io,phiroict/docker,shubheksha/docker.github.io,gdevillele/docker.github.io,johnstep/docker.github.io,shubheksha/docker.github.io,denverdino/denverdino.github.io,londoncalling/docker.github.io,BSWANG/denverdino.github.io,bdwill/docker.github.io,jzwlqx/denverdino.github.io,LuisBosquez/docker.github.io,denverdino/docker.github.io,londoncalling/docker.github.io,anweiss/docker.github.io,bdwill/docker.github.io,LuisBosquez/docker.github.io,denverdino/docker.github.io,shubheksha/docker.github.io,joaofnfernandes/docker.github.io,menglingwei/denverdino.github.io,aduermael/docker.github.io,phiroict/docker,londoncalling/docker.github.io,rillig/docker.github.io,aduermael/docker.github.io,joeuo/docker.github.io,LuisBosquez/docker.github.io,rillig/docker.github.io,denverdino/docker.github.io,JimGalasyn/docker.github.io,thaJeztah/docker.github.io,phiroict/docker,BSWANG/denverdino.github.io,docker/docker.github.io,troy0820/docker.github.io,joaofnfernandes/docker.github.io,rillig/docker.github.io,LuisBosquez/docker.github.io,gdevillele/docker.github.io,alexisbellido/docker.github.io,sanscontext/docker.github.io,joeuo/docker.github.io,thaJeztah/docker.github.io,johnstep/docker.github.io,shin-/docker.github.io,sanscontext/docker.github.io,docker-zh/docker.github.io,thaJeztah/docker.github.io,johnstep/docker.github.io,denverdino/docker.github.io,shin-/docker.github.io,JimGalasyn/docker.github.io,gdevillele/docker.github.io,anweiss/docker.github.io,bdwill/docker.github.io,sanscontext/docker.github.io,docker-zh/docker.github.io,denverdino/denverdino.github.io,anweiss/docker.github.io,johnstep/docker.github.io,johnstep/docker.github.io,docker/docker.github.io,joaofnfernandes/docker.github.io,anweiss/docker.github.io,aduermael/docker.github.io,alexisbellido/docker.github.io