ia64: ptrace: fix typos in comments

Various spelling mistakes in comments.
Detected with the help of Coccinelle.

Link: https://lkml.kernel.org/r/20220318103729.157574-23-Julia.Lawall@inria.fr


Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>