doc: Fix a couple of 'to to' typos

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
doc: Fix pa_stream_set_latency_update_callback() documentation

the latency_update callback is supported on playback AND record
streams

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
tunnel-source-new: Fix shadow compiler warning

  CC     modules/module_tunnel_sink_la-module-tunnel.lo
modules/module-tunnel-source-new.c: In function 'read_new_samples':
modules/module-tunnel-source-new.c:145:16: warning: declaration of 'read' shadows a global declaration [-Wshadow]

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>