riscv: Improve Kconfig help for RISCV_ISA_V_PREEMPTIVE

Fix a couple of spelling issues plus some minor details on the grammar.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Link: https://lore.kernel.org/r/20250501130309.14803-1-mikisabate@gmail.com
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>

Author: mssola

arch/riscv/Kconfig

@@ -669,12 +669,12 @@ config RISCV_ISA_V_PREEMPTIVE
 	default y
 	help
 	  Usually, in-kernel SIMD routines are run with preemption disabled.
-	  Functions which envoke long running SIMD thus must yield core's
+	  Functions which invoke long running SIMD thus must yield the core's
 	  vector unit to prevent blocking other tasks for too long.
 
-	  This config allows kernel to run SIMD without explicitly disable
-	  preemption. Enabling this config will result in higher memory
-	  consumption due to the allocation of per-task's kernel Vector context.
+	  This config allows the kernel to run SIMD without explicitly disabling
+	  preemption. Enabling this config will result in higher memory consumption
+	  due to the allocation of per-task's kernel Vector context.
 
 config RISCV_ISA_ZAWRS
 	bool "Zawrs extension support for more efficient busy waiting"