docs: replace hint with pointer in PVHv2 ACPI documentation

Use pointer instead of hint, since this is the only way to get the address
of the RSDP.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reported-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>

docs/misc/hvmlite.markdown

@@ -69,7 +69,7 @@ The following VCPU hypercalls can be used in order to bring up secondary vCPUs:
 
 PVHv2 guests that have access to hardware (either emulated or real) will also
 have ACPI tables with the description of the hardware that's available to the
-guest. This applies to both privileged and unprivileged guests. A hint of
+guest. This applies to both privileged and unprivileged guests. A pointer to
 the position of the RSDP in memory (if present) can be fetched from the start
 info structure that's passed at boot time (field rsdp_paddr).