Advice to configure pathman_ddl_trigger ENABLE ALWAYS on LR replica

[arssher]

Recently it took me quite a while to investigate why dropped partitioned tables were not removed from pathman_config when DROP TABLE was executed on replica side inside trigger on logically replicated table, so I thought it might be useful to add this to the docs.

[codecov-io]

Codecov Report

Merging #106 into rel_future_beta will not change coverage.
The diff coverage is n/a.

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  Coverage            92.58%   92.58%           
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  Branches               884      884           
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  Hits                  4706     4706           
  Misses                 377      377

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