/usr/share/doc/postgresql-doc-10/extension/README.pg_comparator is in postgresql-comparator 2.3.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | To get help about pg_comparator, try:
sh> pg_comparator --man
To load necessary extensions into PostgreSQL:
psql> CREATE EXTENSION pgcmp;
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