Updating docs for Btrfs by default

[Chris Murphy]

Hi,

This doc is in need of updating for the Btrfs by default feature
approved for Fedora 33:
https://docs.fedoraproject.org/en-US/fedora/f32/install-guide/install/Ins...
https://fedoraproject.org/wiki/Changes/BtrfsByDefault

I can fork https://pagure.io/fedora-docs/install-guide and submit
PR's. But I don't think that method is interactive, i.e. it's pretty
much accept the PR or reject it, correct? Any other ideas?

I've identified these specific areas:

- Automatic partitioning -  should say Btrfs instead of LVM
https://docs.fedoraproject.org/en-US/fedora/f32/install-guide/install/Ins...

- Some partition types - notably the /boot and /usr directories and
the BIOS Boot and EFI partitions - can not be placed on Btrfs
subvolumes. Use standard physical volumes for them (or an LVM logical
volume for /usr). See
Installing_Using_Anaconda.adoc#sect-installation-gui-manual-partitioning-recommended
for more information.

- Ext4 is the default and recommended file system used by Fedora
Workstation and Cloud.

- Advice on Partitions

- Recommended Partitioning Scheme (recommendations, sizes all need updates)
https://docs.fedoraproject.org/en-US/fedora/f32/install-guide/install/Ins...

- Manual partitioning should say Btrfs instead of LVM
https://docs.fedoraproject.org/en-US/fedora/f32/install-guide/install/Ins...

- Silverblue
https://docs.fedoraproject.org/en-US/fedora-silverblue/installation/
https://docs.fedoraproject.org/en-US/fedora-silverblue/technical-informat...

- swap - based on your system parameters
    - unrelated to btrfs, but needs updating for swaponzram feature
https://fedoraproject.org/wiki/Changes/SwapOnZRAM


Original list and discussion appears here:
https://pagure.io/fedora-workstation/issue/158#comment-672898


Thanks,

-- 
Chris Murphy