rpc(3nsl): svc_sendreply is in rpc_svc_calls(3nsl)
manpage - manual pages
The rpc(3nsl) man page says:
Index to Routines The following table lists RPC routines and the manual reference pages on which they are described: RPC Routine Manual Reference Page ... svc_sendreply rpc_svc_reg(3NSL)
That's not true. The svc_sendreply is actually documented in rpc_svc_calls(3nsl). The whole list in rpc(3nsl) should be checked too to be sure there are no other similar issues there.