[DOCS] Invalid sequence for encoding UTF8 0xe86974

[Holec, JPH Software]

Hello, pg_read_file('pg_log... gives me this report and 0xe86974 doesn't know 
Google...
 
Can You help me?
 
PG 8.4.9 on Windows, database UTF8 and client also Windows... and except 
pg_read_file everything works fine...
 
Thank you Pavel