kerneldoc warnings since commit 538fc2ee870a3 ("rcu: Introduce kfree_rcu() single-argument macro")

[Lukas Bulwahn]

Dear Uladzislau,

in commit 538fc2ee870a3 ("rcu: Introduce kfree_rcu() single-argument
macro"), you have refactored the kfree_rcu macro.

Since then, make htmldocs warns:

./include/linux/rcupdate.h:882: warning: Excess function parameter
'ptr' description in 'kfree_rcu'
./include/linux/rcupdate.h:882: warning: Excess function parameter
'rhf' description in 'kfree_rcu'

As you deleted the two arguments in the macro definition, kerneldoc
cannot resolve the argument names in the macro's kerneldoc
documentation anymore and warns about that.

Probably, it is best to just turn the formal kerneldoc references to
the two arguments, which are not used in the macro definition anymore,
simply into two informal references in the documentation.

Best regards,

Lukas