Adding lazy services documentation as of symfony/symfony#7890
(cherry picked from commit 50905ff253e5e1164b377ad5f285d1c439e7bdb7)
Applying changes suggested by @WouterJ, adding lazy_services to components map
(cherry picked from commit 931091d8e3aa0b9d4f1393d313388d5ee1a5d47d)
[#2619] Tweaks for new proxy/lazy services entry
(cherry picked from commit d7ea3a540a5dc425bf1d16f4113746975404da38)