application: Fix demo_dsp Makefile comments

Signed-off-by: Huaqi Fang <[email protected]>

application/baremetal/demo_dsp/Makefile

@@ -18,14 +18,14 @@ STDCLIB ?= newlib_small
 # We provide prebuilt optimized NMSIS DSP/NN library
 # Optimized for the following extensions:
 # B extension: _zba_zbb_zbc_zbs
-# P extension: _xxldspn1x
+# P extension: _xxldsp, _xxldspn1x, _xxldspn2x, _xxldspn3x for rv32, _xxldsp for rv64
 # V extension: _zve32f for rv32, v for rv64
 # The naming order use in ARCH_EXT, should be V, B, P
 # to get correct NMSIS DSP/NN library
 # Example as below:
 # If I want to use Nuclei BPV extensions
 # For RV32: when ARCH_EXT=_zve32f_zba_zbb_zbc_zbs_xxldspn1x
-# For RV64: when ARCH_EXT=v_zba_zbb_zbc_zbs_xxldspn1x
+# For RV64: when ARCH_EXT=v_zba_zbb_zbc_zbs_xxldsp
 # And If you want to specify other NMSIS DSP/NN library
 # you can set NMSIS_LIB_ARCH make variable see NMSIS/build.mk
 # eg. If you want to use rv32imafdc NMSIS DSP library for N300FD + B + K extension