clarify swarm concept
clarify swarm concept

Signed-off-by: Charles Smith <dd8094a0ebe127b002d25a204df37082ff5d8b3b@docker.com>
(cherry picked from commit e0296317131782008dcb94c72d591244663d61b1)

sanscontext/docker.github.io,joeuo/docker.github.io,denverdino/denverdino.github.io,shin-/docker.github.io,troy0820/docker.github.io,denverdino/docker.github.io,LuisBosquez/docker.github.io,medallia/docker,aduermael/docker.github.io,danix800/docker.github.io,jzwlqx/denverdino.github.io,stainboy/docker,denverdino/docker.github.io,danix800/docker.github.io,troy0820/docker.github.io,JimGalasyn/docker.github.io,docker-zh/docker.github.io,londoncalling/docker.github.io,JimGalasyn/docker.github.io,gdevillele/docker.github.io,aduermael/docker.github.io,docker-zh/docker.github.io,phiroict/docker,docker/docker.github.io,menglingwei/denverdino.github.io,phiroict/docker,medallia/docker,alexisbellido/docker.github.io,thaJeztah/docker.github.io,bdwill/docker.github.io,anweiss/docker.github.io,docker/docker.github.io,stainboy/docker,anweiss/docker.github.io,menglingwei/denverdino.github.io,menglingwei/denverdino.github.io,denverdino/docker.github.io,bdwill/docker.github.io,alexisbellido/docker.github.io,denverdino/denverdino.github.io,shin-/docker.github.io,Shopify/docker,denverdino/denverdino.github.io,anweiss/docker.github.io,aduermael/docker.github.io,bdwill/docker.github.io,alexisbellido/docker.github.io,joeuo/docker.github.io,phiroict/docker,JimGalasyn/docker.github.io,phiroict/docker,joaofnfernandes/docker.github.io,jzwlqx/denverdino.github.io,docker-zh/docker.github.io,shubheksha/docker.github.io,troy0820/docker.github.io,LuisBosquez/docker.github.io,Shopify/docker,joaofnfernandes/docker.github.io,menglingwei/denverdino.github.io,phiroict/docker,BSWANG/denverdino.github.io,BSWANG/denverdino.github.io,joaofnfernandes/docker.github.io,danix800/docker.github.io,denverdino/denverdino.github.io,bdwill/docker.github.io,sanscontext/docker.github.io,jzwlqx/denverdino.github.io,joaofnfernandes/docker.github.io,rillig/docker.github.io,sanscontext/docker.github.io,johnstep/docker.github.io,BSWANG/denverdino.github.io,aduermael/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,shubheksha/docker.github.io,joeuo/docker.github.io,denverdino/denverdino.github.io,joeuo/docker.github.io,londoncalling/docker.github.io,gdevillele/docker.github.io,londoncalling/docker.github.io,medallia/docker,shin-/docker.github.io,shin-/docker.github.io,denverdino/docker.github.io,BSWANG/denverdino.github.io,thaJeztah/docker.github.io,Shopify/docker,joaofnfernandes/docker.github.io,johnstep/docker.github.io,thaJeztah/docker.github.io,rillig/docker.github.io,johnstep/docker.github.io,docker/docker.github.io,shubheksha/docker.github.io,JimGalasyn/docker.github.io,johnstep/docker.github.io,rillig/docker.github.io,shin-/docker.github.io,thaJeztah/docker.github.io,medallia/docker,danix800/docker.github.io,gdevillele/docker.github.io,joeuo/docker.github.io,gdevillele/docker.github.io,gdevillele/docker.github.io,menglingwei/denverdino.github.io,stainboy/docker,shubheksha/docker.github.io,bdwill/docker.github.io,shubheksha/docker.github.io,docker-zh/docker.github.io,denverdino/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,JimGalasyn/docker.github.io,LuisBosquez/docker.github.io,sanscontext/docker.github.io,jzwlqx/denverdino.github.io,alexisbellido/docker.github.io,docker/docker.github.io,troy0820/docker.github.io,LuisBosquez/docker.github.io,alexisbellido/docker.github.io,LuisBosquez/docker.github.io,docker/docker.github.io,johnstep/docker.github.io,docker-zh/docker.github.io,BSWANG/denverdino.github.io,jzwlqx/denverdino.github.io,sanscontext/docker.github.io,thaJeztah/docker.github.io,rillig/docker.github.io