pg_buffercache query example results misleading, grouping by just relname, needs schema_name

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Page: https://www.postgresql.org/docs/12/pgbuffercache.html
Description:

The pg_buffercache query example results are misleading. The "group by" uses
just by relname. It needs to include pg_namespace.nspname, without it, if
the same object exists in multiple schemas, the buffer count is summed for
those multiple distinct objects.  
In: https://www.postgresql.org/docs/12/pgbuffercache.html
Alternative SQL (the count is now correct for tables in multiple schemas):
SELECT ts.nspname AS schema_name,c.relname, count(*) AS buffers
             FROM pg_buffercache b INNER JOIN pg_class c
             ON b.relfilenode = pg_relation_filenode(c.oid) AND
                b.reldatabase IN (0, (SELECT oid FROM pg_database
                                      WHERE datname = current_database()))
             JOIN pg_namespace ts ON ts.oid = c.relnamespace
             GROUP BY ts.nspname,c.relname
             ORDER BY buffers DESC
             LIMIT 10;

Example Results:
Current Query returns 1 row with buffer count summed for 3 tables:
relname buffers
tab1    72401

Modified Query:
schema_name     relname buffers
schema1 tab1    1883
schema2 tab1    69961
schema3 tab1    557