/usr/share/postgresql/10/extension/citus--5.2-2--5.2-3.sql is in postgresql-10-citus 7.0.3.PGDG-1.
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 | /* citus--5.2-2--5.2-3.sql */
CREATE OR REPLACE FUNCTION master_expire_table_cache(table_name regclass)
RETURNS VOID
LANGUAGE C STRICT
AS 'MODULE_PATHNAME', $$master_expire_table_cache$$;
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