docs: update docker guide

[aeneasr]

Closes #2086

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
  confirm that I got green light (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #2089 (ed455d8) into master (f330df0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2089   +/-   ##
=======================================
  Coverage   74.97%   74.98%           
=======================================
  Files         293      293           
  Lines       15355    15355           
=======================================
+ Hits        11513    11514    +1     
+ Misses       3013     3012    -1     
  Partials      829      829           

Impacted Files	Coverage Δ
driver/registry_default.go	86.23% <ø> (ø)
persistence/sql/persister.go	74.72% <ø> (ø)
persistence/sql/persister_identity.go	63.94% <ø> (+0.37%)	⬆️
persistence/sql/persister_login.go	100.00% <ø> (ø)
persistence/sql/persister_recovery.go	80.00% <ø> (ø)
persistence/sql/persister_transaction_helpers.go	100.00% <ø> (ø)
persistence/sql/persister_verification.go	77.77% <ø> (ø)
x/xsql/sql.go	92.30% <ø> (ø)
courier/test/persistence.go	100.00% <100.00%> (ø)
persistence/sql/persister_courier.go	85.00% <100.00%> (ø)
... and 1 more

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