docs(rdb): improve documentation about rdb connect with password file configuration

[jremy42]

close #3844

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.46%. Comparing base (85d6cfc) to head (e0db858).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@ ## master #5108 +/- ## ======================================= Coverage 57.46% 57.46% ======================================= Files 308 308 Lines 67209 67209 ======================================= Hits 38623 38623 Misses 27148 27148 Partials 1438 1438 

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