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docs: improve "rclone about" docs and relate to union mfs limitation in ftp remote 

See: https://forum.rclone.org/t/rclone-union-mfs-most-free-space-not-working-for-ftp/20346
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5
docs/content/ftp.md
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@ -236,6 +236,11 @@ through rclone are time of upload.
Rclone's FTP backend does not support any checksums but can compare
file sizes.
`rclone about` is not supported by the FTP backend. Backends without
this capability cannot determine free space for an rclone mount or
use policy `mfs` (most free space) as a member of an rclone union
remote. [More](https://rclone.org/overview/#optional-features)
The implementation of : `--dump headers`,
`--dump bodies`, `--dump auth` for debugging isn't the same as
for rclone HTTP based backends - it has less fine grained control.

17
docs/content/overview.md
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@ -318,9 +318,8 @@ remote itself may assign the MIME type.
## Optional Features ##
All the remotes support a basic set of features, but there are some
optional features supported by some remotes used to make some
operations more efficient.
All rclone remotes support a base command set. Other features depend
upon backend specific capabilities.
| Name | Purge | Copy | Move | DirMove | CleanUp | ListR | StreamUpload | LinkSharing | About | EmptyDir |
| ---------------------------- |:-----:|:----:|:----:|:-------:|:-------:|:-----:|:------------:|:------------:|:-----:| :------: |
@ -424,13 +423,15 @@ on the particular cloud provider.
### About ###
This is used to fetch quota information from the remote, like bytes
used/free/quota and bytes used in the trash.
Rclone `about` prints quota information for a remote. Typical output
includes bytes used, free, quota and in trash.
This is also used to return the space used, available for `rclone mount`.
If a remote lacks about capability `rclone about remote:`returns
an error.
If the server can't do `About` then `rclone about` will return an
error.
Backends without about capability cannot determine free space for an
rclone mount, or use policy `mfs` (most free space) as a member of an
rclone union remote.
### EmptyDir ###