doc: Document 'mount-may-fail?' field.

This is a followup to 7c27bd115b14afd142da7684cc349369965f9eab.

* doc/guix.texi (File Systems): Document 'mount-may-fail?'.
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Ludovic Courtès 2020-08-03 17:14:54 +02:00
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@ -12165,6 +12165,12 @@ errors before being mounted.
@item @code{create-mount-point?} (default: @code{#f})
When true, the mount point is created if it does not exist yet.
@item @code{mount-may-fail?} (default: @code{#f})
When true, this indicates that mounting this file system can fail but
that should not be considered an error. This is useful in unusual
cases; an example of this is @code{efivarfs}, a file system that can
only be mounted on EFI/UEFI systems.
@item @code{dependencies} (default: @code{'()})
This is a list of @code{<file-system>} or @code{<mapped-device>} objects
representing file systems that must be mounted or mapped devices that