chore: clearer message for errors-only mode

[aldy505]

Some people are missing the COMPOSE_PROFILES in their .env file, Hopefully this clears everything up (and make the SENTRY_SELF_HOSTED_ERRORS_ONLY variable stands out on the config file.

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.06%. Comparing base (01d7741) to head (b8d0559).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3487      +/-   ##
==========================================
- Coverage   99.03%   98.06%   -0.97%     
==========================================
  Files           3        3              
  Lines         207      207              
==========================================
- Hits          205      203       -2     
- Misses          2        4       +2     

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