minijail0: update -i usage

The -i flag works just fine with the -p flag, so drop the comment
suggesting otherwise.

Bug: None
Test: ran minijail0 with -i -p and it worked as expected
Change-Id: I1820d41cc0fb9a0f8e972e23d54ac157a88b8de9
diff --git a/minijail0.c b/minijail0.c
index 5917b44..470a8df 100644
--- a/minijail0.c
+++ b/minijail0.c
@@ -139,7 +139,6 @@
 	       "  -h:         Help (this message).\n"
 	       "  -H:         Seccomp filter help message.\n"
 	       "  -i:         Exit immediately after fork (do not act as init).\n"
-	       "              Not compatible with -p.\n"
 	       "  -I:         Run <program> as init (pid 1) inside a new pid namespace (implies -p).\n"
 	       "  -K:         Don't mark all existing mounts as MS_PRIVATE.\n"
 	       "  -l:         Enter new IPC namespace.\n"