Documentation/arm64: Fix the typo of register names

The register name 'HWFGWTR_EL2' and 'HWFGRTR_EL2' is wrong, should be 'HFGWTR_EL2' and 'HFGRTR_EL2'.
Find the register description on arm website here,
https://developer.arm.com/documentation/ddi0601/2025-09/AArch64-Registers/HFGWTR-EL2--Hypervisor-Fine-Grained-Write-Trap-Register
https://developer.arm.com/documentation/ddi0601/2025-09/AArch64-Registers/HFGRTR-EL2--Hypervisor-Fine-Grained-Read-Trap-Register?lang=en

Signed-off-by: Zenon Xiu <zenonxiu@outlook.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Author: zenonxiu81

Documentation/arch/arm64/booting.rst

@@ -391,13 +391,13 @@ Before jumping into the kernel, the following conditions must be met:
     - SMCR_EL2.LEN must be initialised to the same value for all CPUs the
       kernel will execute on.
 
-    - HWFGRTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
+    - HFGRTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
 
-    - HWFGWTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
+    - HFGWTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
 
-    - HWFGRTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
+    - HFGRTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
 
-    - HWFGWTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
+    - HFGWTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
 
   For CPUs with the Scalable Matrix Extension FA64 feature (FEAT_SME_FA64):