doc: Update 'soc-cfg' usage on Nuclei qemu

[muxiff]

Important

Update source/qemu/intro.rst to correct address allocation and enhance JSON configuration examples for Nuclei QEMU.

• Documentation Updates:
  • Corrected address allocation table by moving IINFO to Peripherals (Offset) and MROM to Peripherals (Fixed) in source/qemu/intro.rst.
  • Added size attribute to uart0 and uart1 in JSON configuration example.
  • Added enable attribute to qspi2 and plic attribute to iregion in JSON configuration example.
  • Updated description of irqmax to specify total IRQs must be greater than 40.
  • Removed note about base attribute format requirements in JSON configuration.

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[fanghuaqi]

需要更新一下changelog，暂定 2026.06 , 里面就写哪些特性是这个版本引入的