Fix all occurrences of "grub.protocol" in OSDK.toml

OSDK.toml

@@ -6,7 +6,7 @@
 method = "grub-rescue-iso"
 
 [grub]
-protocol = "multiboot2"
+boot_protocol = "multiboot2"
 
 [qemu]
 args = "$(./tools/qemu_args.sh normal)"

book/src/osdk/guide/intel-tdx.md

@@ -50,7 +50,7 @@ For example, you can append the following TDX-specific scheme to your `OSDK.toml
 supported_archs = ["x86_64"]
 boot.method = "grub-qcow2"
 grub.mkrescue_path = "~/tdx-tools/grub"
-grub.protocol = "linux"
+grub.boot_protocol = "linux"
 qemu.args = """\
     -accel kvm \
     -m 8G \

book/src/osdk/reference/manifest.md

@@ -44,7 +44,7 @@ init_args = ["sh", "-l"]                    # <11>
 initramfs = "path/to/it"                    # <12>
 [grub]                                      # <13>  
 mkrescue_path = "path/to/it"                # <14>
-protocol = "multiboot2"                     # <15> 
+boot_protocol = "multiboot2"                # <15> 
 display_grub_menu = false                   # <16>
 [qemu]                                      # <17>
 path = "path/to/it"                         # <18>

osdk/src/config/test/OSDK.toml.full

@@ -21,7 +21,7 @@ boot.initramfs = "/tmp/osdk_test_file"
 boot.method = "qemu-direct"
 
 [grub]
-protocol = "multiboot2"
+boot_protocol = "multiboot2"
 display_grub_menu = true
 
 [qemu]