Fix some fate filter tests with --target-path.
Fix rc_max_rate documentation.

The mpegvideo decoder sets rc_max_rate since 25b7aa98.
Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Fix rc_max_rate documentation.
  Fix some fate filter tests with --target-path.

Merged-by: Michael Niedermayer <michaelni@gmx.at>