removed wrong example path

cmake/Doxyfile.in

@@ -886,8 +886,7 @@ EXCLUDE_SYMBOLS        = ChimeraTK::detail
 # that contain example code fragments that are included (see the \include
 # command).
 
-EXAMPLE_PATH           = @CMAKE_CURRENT_SOURCE_DIR@ \
-                         @CMAKE_CURRENT_SOURCE_DIR@/example
+EXAMPLE_PATH           = @CMAKE_CURRENT_SOURCE_DIR@
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and