Revert "doc: fix for techdoc-3981"

This reverts commit 9497c45.

Signed-off-by: Michał Stasiak <[email protected]>

Author: mstasiaknordic

doc/nrfx/nrfx.doxyfile.in

@@ -1031,7 +1031,7 @@ RECURSIVE              = YES
 # Note that relative paths are relative to the directory from which Doxygen is
 # run.
 
-EXCLUDE                = @DOCSET_SOURCE_BASE@/nrfx/doc/nrf9230_engb.dox
+EXCLUDE                =
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
 # directories that are symbolic links (a Unix file system feature) are excluded