Remove code help markdown files from doxygen

Doxyfile

@@ -853,7 +853,9 @@ EXCLUDE_SYMLINKS       = NO
 # Note that the wildcards are matched against the file with absolute path, so to
 # exclude all test directories for example use the pattern */test/*
 
-EXCLUDE_PATTERNS       =
+EXCLUDE_PATTERNS       = */pcb_calculator/*.md \
+                         */pcb_calculator/attenuators/*.md \
+                         */eeschema/dialogs/*.md
 
 # The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names
 # (namespaces, classes, functions, etc.) that should be excluded from the