Fix comment in shm_event_loop

Change-Id: Ic80ac8ab02f769be5d45a3e67569fb6ea4e3370f
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/events/shm_event_loop.cc b/aos/events/shm_event_loop.cc
index 2ca27ac..314e366 100644
--- a/aos/events/shm_event_loop.cc
+++ b/aos/events/shm_event_loop.cc
@@ -50,7 +50,7 @@
 // WITH THE DEFAULT UMASK YOU WONT ACTUALLY GET THESE PERMISSIONS :)
 DEFINE_uint32(permissions, 0770,
               "Permissions to make shared memory files and folders, "
-              "effected by the processes umask. "
+              "affected by the process's umask. "
               "See shm_event_loop.cc for more details.");
 DEFINE_string(application_name, Filename(program_invocation_name),
               "The application name");