Updated to 2.3.0
fixed typo
updated components to 2.3
removed branch versions
Update installation.rst
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)
Merge branch '2.3'
added information about security issue fixes, and made the timeline example clearer
[#2715] Adding missing target
Merge branch '2.1' into 2.2
Merge branch '2.2' into 2.3

Conflicts:
	components/locale.rst
Merge branch '2.3'
Merge pull request #2688 from MyKiwi/2.3

Updated to 2.3.0
[#2688] Minor tweaks to version stuff in create-project
Merge branch '2.3'
Removed all 2.2 versionadded directives
Removed more 2.2 references