Leave wiggle room in --observe documentation.
BUG=
Review URL: https://codereview.chromium.org/1975273002 .
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index c296cde..5ab2826 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -858,11 +858,12 @@
"--observe[=<port>[/<bind-address>]]\n"
" The observe flag is a convenience flag used to run a program with a\n"
" set of options which are often useful for debugging under Observatory.\n"
-" These default options are:\n"
+" These options are currently:\n"
" --enable-vm-service[=<port>[/<bind-address>]]\n"
" --pause-isolates-on-exit\n"
" --pause-isolates-on-unhandled-exceptions\n"
" --warn-on-pause-with-no-debugger\n"
+" This set is subject to change.\n"
" Please see these options (--help --verbose) for further documentation.\n"
"--version\n"
" Print the VM version.\n");
@@ -881,11 +882,12 @@
"--observe[=<port>[/<bind-address>]]\n"
" The observe flag is a convenience flag used to run a program with a\n"
" set of options which are often useful for debugging under Observatory.\n"
-" These default options are:\n"
+" These options are currently:\n"
" --enable-vm-service[=<port>[/<bind-address>]]\n"
" --pause-isolates-on-exit\n"
" --pause-isolates-on-unhandled-exceptions\n"
" --warn-on-pause-with-no-debugger\n"
+" This set is subject to change.\n"
" Please see these options for further documentation.\n"
"--version\n"
" Print the VM version.\n"
