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plan9.ini(8), boot(8): clarify the use of $rootdir and $rootspec

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

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

@@ -127,9 +127,10 @@

 .PP

 Once connected,

 .I boot

-mounts

-the root file system before

-.B /

+mounts the root file system at

+.B /root

+(with the optional mount spec argument from

+.BR $rootspec )

 and makes the connection available as

 .B #s/boot

 for subsequent processes to

@@ -136,6 +137,13 @@

 .B mount

 (see

 .IR bind (2)).

+It then binds

+.B /root

+(or the value specified by

+.BR $rootdir )

+after the

+.BR /

+directory.

 .I Boot

 completes by 

 .IR exec (2)'ing

--- a/sys/man/8/plan9.ini

+++ b/sys/man/8/plan9.ini

@@ -691,10 +691,24 @@

 for more.

 .SS \fLnobootprompt=\fIvalue\fP

 Suppress the

-.L "root from"

+.L bootargs

 prompt and use

 .I value

 as the answer instead.

+.SS \fLrootdir=\fB/root/\fIdir\fP

+.SS \fLrootspec=\fIspec\fP

+Changes the mount arguments for the root file server

+that was specified by

+.I bootargs

+above.

+By changing

+.I dir

+in

+.BR $rootdir ,

+a different sub-directory on the root file server

+can be used as the system root. see

+.IR boot (8)

+for details.

 .SS \fLuser=\fIvalue\fP

 Suppress the

 .L "user"