Fix for issue 1693 (HSLEN should be HSXLEN)

Author: james-ball-qualcomm

src/hypervisor.adoc

@@ -168,7 +168,7 @@ register provides facilities analogous to the `mstatus` register for
 tracking and controlling the exception behavior of a VS-mode guest.
 
 [[hstatusreg-rv32]]
-.Hypervisor status register (`hstatus`) when HSLEN=32
+.Hypervisor status register (`hstatus`) when HSXLEN=32
 include::images/bytefield/hstatusreg-rv32.edn[]
 
 [[hstatusreg]]