docs: Refer to the correct kernel config to enable PVH on linux

Enabling CONFIG_XEN_PVH=y is for booting on the actual Xen hypervisor.
To boot using PVH on a non-Xen hypervisor, set CONFIG_PVH=y.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

CHANGELOG.md

@@ -142,8 +142,8 @@ and this project adheres to
   Firecracker. As a result, Firecracker snapshot version is now 2.0.0.
 - Added support for PVH boot mode.  This is used when an x86 kernel provides
   the appropriate ELF Note to indicate that PVH boot mode is supported.
-  Linux kernels compiled with CONFIG_XEN_PVH=y set this ELF Note, as do
-  FreeBSD kernels.
+  Linux kernels newer than 5.0 compiled with `CONFIG_PVH=y` set this ELF Note,
+  as do FreeBSD kernels.
 
 ### Changed
 

docs/pvh.md

@@ -7,7 +7,7 @@ then this boot mode will be used.  This boot mode was designed for virtualized
 environments which load the kernel directly, and is simpler than the "Linux
 boot" mode which is designed to be launched from a legacy boot loader.
 
-PVH boot mode can be enabled for Linux by setting CONFIG_XEN_PVH=y in the
+PVH boot mode can be enabled for Linux by setting `CONFIG_PVH=y` in the
 kernel configuration.  (This is not the default setting.)
 
 PVH boot mode is enabled by default in FreeBSD, which has support for