Update docker.adoc: link optimization

[sjjh]

optimized link to influxdb container setup by specifying an earlier headline.
Before you had to scroll up some lines, as you were jumping directly to the influxdb command, instead of to the docker_compose.yml changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3785      +/-   ##
=============================================
- Coverage      60.61%   60.58%   -0.03%     
  Complexity       105      105              
=============================================
  Files           3356     3356              
  Lines         146350   146350              
  Branches       10852    10852              
=============================================
- Hits           88701    88655      -46     
- Misses         54313    54367      +54     
+ Partials        3336     3328       -8     

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