Do not advertise unmaintained extensions
Do not advertise PEAR as an installation method
Use a target that actually exists
Cleanup upgrading section(s)
Update installation instructions for vfsStream to use Composer
Rephrase
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Leftover from 8cda28f0a0d3eaa8dee2d5f6df80b22a5635c4e2
Leftover from 05bffa8a995b25c9fc1f31211877baffc4a2d1f6