M #-: Add final release sentence

source/intro_release_notes/release_notes/whats_new.rst

@@ -59,6 +59,8 @@ Beginning on version 6.10, users of the :ref:`Community Edition <what_is_communi
 
 OpenNebula 6.10 is named after the `Bubble Nebula <https://www.constellation-guide.com/bubble-nebula-ngc-7635/>`__ (NGC 7635) in the constellation Cassiopeia. It is a young, glowing emission nebula energized by a hot, massive central star. Partly located in a group of stars between 7000 and 8000 light-years away from Earth, the Bubble Nebula is in expansion, with a central “bubble” measuring between six and ten light-years and an estimated temperature of more than 37,000 degrees Celsius (67,000 Fahrenheit). It was discovered by the celebrated astronomer William Herschel in 1787.
 
+OpenNebula 6.10 ‘Bubble’ is considered to be a stable release and as such it is available to update production environments.
+
 We’d like to thank all the people that :ref:`support the project<acknowledgements>`, OpenNebula is what it is thanks to its community! Please keep rocking.
 
 OpenNebula Core