doc: fix typo in doxygen cfgs for nmsis dsp and nn

Signed-off-by: Huaqi Fang <578567190@qq.com>

Author: fanghuaqi

NMSIS/doc/source/doxygen/nmsis_dsp.dxy

@@ -1294,7 +1294,7 @@ GENERATE_HTMLHELP      = NO
 # written to the html output directory.
 # This tag requires that the tag GENERATE_HTMLHELP is set to YES.
 
-CHM_FILE               = NMSIS_Core.chm
+CHM_FILE               = NMSIS_DSP.chm
 
 # The HHC_LOCATION tag can be used to specify the location (absolute path
 # including file name) of the HTML help compiler (hhc.exe). If non-empty,

NMSIS/doc/source/doxygen/nmsis_nn.dxy

@@ -1293,7 +1293,7 @@ GENERATE_HTMLHELP      = NO
 # written to the html output directory.
 # This tag requires that the tag GENERATE_HTMLHELP is set to YES.
 
-CHM_FILE               = NMSIS_Core.chm
+CHM_FILE               = NMSIS_NN.chm
 
 # The HHC_LOCATION tag can be used to specify the location (absolute path
 # including file name) of the HTML help compiler (hhc.exe). If non-empty,