riscv: Fix matrix helper file cleanup issues

Add the missing trailing newlines and clarify that mtilek is tracked in bytes for A/B tile helpers so the comments match the implementation.

Author: xyyy1420

target/riscv/insn_trans/trans_rvmm.c.inc

@@ -550,4 +550,4 @@ static bool trans_macquire(DisasContext *s, arg_mm_async *a)
         return false;
     }
     return true;
-}
+}

target/riscv/matrix_helper.c

@@ -29,9 +29,9 @@ void helper_msettilen(CPURISCVState *env, target_ulong s1)
 /* Matrix Load/Store helpers */
 /*
  * The v0.6 proposal defines 3 tile shapes (based on C = A x B^T):
- *   - A tile  : mtilem x mtilek  (mtilem rows, mtilek elements per row)
- *   - B tile  : mtilen x mtilek
- *   - C tile  : mtilem x mtilen
+ *   - A tile  : mtilem x mtilek  (mtilem rows, mtilek bytes per row)
+ *   - B tile  : mtilen x mtilek  (mtilen rows, mtilek bytes per row)
+ *   - C tile  : mtilem x mtilen  (element counts in both dimensions)
  *
  * rs1 base address, rs2 row byte stride. Whole-matrix load/store ignores tile
  * sizes and uses the full physical register shape (get_mrows x get_rlenb).
@@ -950,4 +950,4 @@ void helper_mfmacc_s_e5(void *md, void *ms1, void *ms2, CPURISCVState *env)
 {
     /* FP8-E5 FP32 semantics not yet implemented; trap as illegal. */
     riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
-}
+}