[clang] [NFC][Clang][RISCV] Fix index typos of riscv-v-spec doc in riscv_vector.td (PR #65944)

[Ying Chen via cfe-commits]

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@@ -2262,11 +2262,11 @@ defm vmfgt : RVVFloatingMaskOutBuiltinSet;
 defm vmfge : RVVFloatingMaskOutBuiltinSet;
 }
 
-// 14.14. Vector Floating-Point Classify Instruction
+// 13.14. Vector Floating-Point Classify Instruction
 let Name = "vfclass_v", UnMaskedPolicyScheme = HasPassthruOperand in
   def vfclass : RVVOp0Builtin<"Uv", "Uvv", "xfd">;
 
-// 14.15. Vector Floating-Point Merge Instructio
+// 13.15. Vector Floating-Point Merge Instructio
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punkyc wrote:

Fix it.

https://github.com/llvm/llvm-project/pull/65944