[AWARE] Update HAL 1.0 documentation for Match Filter

Update the documentation for Service Discovery Indication /
Match Filter to clarify that for Active Subscribe it is the
filter specified on the Subscribe itself (as opposed to on the
matching Publish).

No behavior change - just documentation of existing (1.0) functionality.

Bug: 71359797
Test: builds
Change-Id: Iae4c374b5e0b75b1af6587bfd7b6a21c99ecc7f4