Attempt to document escaping env vars
Attempt to document escaping env vars

People are likely to run into their env vars being set to empty strings,
if they're not aware that they need to escape them for Compose to not
interpolate them.

Signed-off-by: Mazz Mosley <a54aae760072825ca6733a7dfc4aa39211f100a9@houseofmnowster.com>

jzwlqx/denverdino.github.io,docker-zh/docker.github.io,denverdino/denverdino.github.io,joaofnfernandes/docker.github.io,shin-/docker.github.io,hoogenm/compose,aduermael/docker.github.io,johnstep/docker.github.io,alexisbellido/docker.github.io,alexisbellido/docker.github.io,joaofnfernandes/docker.github.io,shin-/compose,joeuo/docker.github.io,BSWANG/denverdino.github.io,menglingwei/denverdino.github.io,shubheksha/docker.github.io,menglingwei/denverdino.github.io,vdemeester/compose,vdemeester/compose,menglingwei/denverdino.github.io,gdevillele/docker.github.io,bdwill/docker.github.io,sdurrheimer/compose,LuisBosquez/docker.github.io,JimGalasyn/docker.github.io,denverdino/denverdino.github.io,thaJeztah/docker.github.io,joeuo/docker.github.io,bdwill/docker.github.io,swoopla/compose,sdurrheimer/compose,LuisBosquez/docker.github.io,thaJeztah/docker.github.io,JimGalasyn/docker.github.io,shin-/docker.github.io,jzwlqx/denverdino.github.io,denverdino/docker.github.io,j-fuentes/compose,bdwill/docker.github.io,menglingwei/denverdino.github.io,shin-/docker.github.io,jzwlqx/denverdino.github.io,bdwill/docker.github.io,anweiss/docker.github.io,bdwill/docker.github.io,anweiss/docker.github.io,phiroict/docker,dnephin/compose,troy0820/docker.github.io,LuisBosquez/docker.github.io,alexisbellido/docker.github.io,dnephin/compose,danix800/docker.github.io,shin-/docker.github.io,gdevillele/docker.github.io,alexisbellido/docker.github.io,LuisBosquez/docker.github.io,jrabbit/compose,denverdino/denverdino.github.io,troy0820/docker.github.io,joeuo/docker.github.io,rillig/docker.github.io,johnstep/docker.github.io,anweiss/docker.github.io,aduermael/docker.github.io,rillig/docker.github.io,shubheksha/docker.github.io,swoopla/compose,rillig/docker.github.io,danix800/docker.github.io,gdevillele/docker.github.io,sanscontext/docker.github.io,joeuo/docker.github.io,phiroict/docker,BSWANG/denverdino.github.io,aduermael/docker.github.io,danix800/docker.github.io,denverdino/docker.github.io,londoncalling/docker.github.io,docker/docker.github.io,phiroict/docker,funkyfuture/docker-compose,joeuo/docker.github.io,denverdino/docker.github.io,johnstep/docker.github.io,schmunk42/compose,thaJeztah/compose,denverdino/docker.github.io,gdevillele/docker.github.io,londoncalling/docker.github.io,hoogenm/compose,londoncalling/docker.github.io,jrabbit/compose,sanscontext/docker.github.io,anweiss/docker.github.io,j-fuentes/compose,JimGalasyn/docker.github.io,troy0820/docker.github.io,johnstep/docker.github.io,londoncalling/docker.github.io,denverdino/denverdino.github.io,shubheksha/docker.github.io,LuisBosquez/docker.github.io,shin-/compose,johnstep/docker.github.io,thaJeztah/compose,menglingwei/denverdino.github.io,docker/docker.github.io,aduermael/docker.github.io,JimGalasyn/docker.github.io,sanscontext/docker.github.io,denverdino/denverdino.github.io,troy0820/docker.github.io,jzwlqx/denverdino.github.io,rillig/docker.github.io,funkyfuture/docker-compose,joaofnfernandes/docker.github.io,danix800/docker.github.io,denverdino/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,jzwlqx/denverdino.github.io,phiroict/docker,joaofnfernandes/docker.github.io,joaofnfernandes/docker.github.io,sanscontext/docker.github.io,gdevillele/docker.github.io,alexisbellido/docker.github.io,shubheksha/docker.github.io,londoncalling/docker.github.io,phiroict/docker,sanscontext/docker.github.io,docker-zh/docker.github.io,anweiss/docker.github.io,docker-zh/docker.github.io,JimGalasyn/docker.github.io,BSWANG/denverdino.github.io,BSWANG/denverdino.github.io,shubheksha/docker.github.io,docker-zh/docker.github.io,docker-zh/docker.github.io,docker/docker.github.io,shin-/docker.github.io,BSWANG/denverdino.github.io,schmunk42/compose,thaJeztah/docker.github.io,docker/docker.github.io