releases: update command to get email addresses

The get_maintainer.py script now has an option to show the email
addresses to be used when sending release announcements. Document it.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
diff --git a/general/releases.rst b/general/releases.rst
index 1e66bff..bf17109 100644
--- a/general/releases.rst
+++ b/general/releases.rst
@@ -107,12 +107,11 @@
        MAINTAINERS_ file.
 
        .. hint::
-            With this command in bash you will get all email addresses
+            With this command you will get all email addresses
 
             .. code-block:: bash
 
-                $ cat MAINTAINERS | grep '[RM]:.*<.*@.*>' | \
-                  sed 's/>.*/>/' | sed 's/.:\t//' | sort | uniq
+                $ scripts/get_maintainer.py --release-to
 
     3. Increment the revision number in `mk/config.mk`:
        ``CFG_OPTEE_REVISION_MAJOR`` and ``CFG_OPTEE_REVISION_MINOR``. These