doxygen formatting of documented types

[tim@…]

cleaning up a class reference for doxygen, i have the following issue:

if a typename is documented, it is rendered like this: typedef implementation_defined::type1 my_type1;

if it is not documented like this: typedef implementation_defined::type2 my_type2;

in the first case, my_type1 is a link to the documentation, in the second case my_type2 is a simple symbol. however my_type2 is aligned with all other typedef symbols, while my_type1 is only one space after the declaration.

in order to generate nice help files, if the documented my_type1 would be aligned with my_type2.

[Steven Watanabe]

(In [75013]) Align documented typedefs. Fixes #5798.