README.md: Update with difference between runparts & /etc/rc.local

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

README.md

@@ -240,19 +240,23 @@ For more information, see [doc/plugins.md](doc/plugins.md).
 Runparts & /etc/rc.local
 ------------------------
 
-At the end of the boot, when networking and all services are up, Finit
+At the end of the boot, when all bootstrap (`S`) tasks and services and
-calls its built-in [run-parts(8)][] on the `runparts <DIR>` directory,
+networking has started, Finit calls its built-in [run-parts(8)][] on the
-and `/etc/rc.local`, in that order if they exist.
+`runparts <DIR>` directory.  This happens just before changing to the
+configured runlevel (default 2).
 
 ```shell
 runparts /etc/rc.d/
 ```
 
+Right after the runlevel change when all services have started properly,
+`/etc/rc.local` is called.
+
 No configuration stanza in `/etc/finit.conf` is required for `rc.local`.
-If it exists and is an executable shell script, finit calls it at the
+If it exists and is an executable shell script Finit calls it at the very
-very end of the boot, before calling the `HOOK_SYSTEM_UP`.  See more on
+end of the boot, before calling the `HOOK_SYSTEM_UP`.  See more on hooks
-hooks in [doc/plugins.md](doc/plugins.md#hooks), and about the system
+in [doc/plugins.md](doc/plugins.md#hooks), and about the system bootstrap
-bootstrap in [doc/bootstrap.md](doc/bootstrap.md).
+in [doc/bootstrap.md](doc/bootstrap.md).
 
 
 Runlevels