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9boot(8): update manual to reflect efi loader search order changes

the efi loader now looks for plan9.ini and the kernel in the ESP
first, before looking elsewhere.

--- a/sys/man/8/9boot

+++ b/sys/man/8/9boot

@@ -47,7 +47,7 @@

 .SS

 There are many ways to boot a PC so

 .IR 9boot

-was split into a number of distinct programs one for each boot

+was split into a number of distinct programs, one for each boot

 method.

 .SH FAT BOOTING

 When booting Plan 9 from a harddisk or USB pen drive, a

@@ -143,8 +143,18 @@

 configuration is read from it in the same way as

 with the BIOS-based

 .I 9boot*

-loaders.

-

+loaders.  If the EFI loader was executed from a 

+.B FAT

+partition, it will first search for

+.IR plan9.ini (8)

+in the same

+.B FAT 

+filesystem that it was loaded from, and if not found, will search for 

+.IR plan9.ini (8)

+in any other partition in an implementation-defined order.  The kernel

+is always loaded from the same partition that

+.IR plan9.ini (8)

+is read from.

 .SH FILES

 .B /386/pbs

 .br

@@ -171,6 +181,8 @@

 .IR mk9660 (8),

 .IR dhcpd (8),

 .IR ndb (6)

+.br

+.I https://uefi.org

 .SH HISTORY

 9boot first appeared in 9front (April, 2011).

 EFI support first appeared in 9front (Oct, 2014).