[binutils-gdb] select_event_lwp_callback: update comments

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT b90fc18880972f0c2ed280df20604d89f1d4ec38 ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: b90fc18880972f0c2ed280df20604d89f1d4ec38

select_event_lwp_callback: update comments
This function (in both GDB and GDBserver) used to consider only
SIGTRAP/breakpoint events, but that's no longer the case nowadays.

gdb/gdbserver/ChangeLog:
2015-03-19  Pedro Alves  <palves@redhat.com>

	* linux-low.c (select_event_lwp_callback): Update comments to
	no longer mention SIGTRAP.

gdb/ChangeLog:
2015-03-19  Pedro Alves  <palves@redhat.com>

	* linux-nat.c (select_event_lwp_callback): Update comment to no
	longer mention SIGTRAP.