strace.1: fix format of -P description
strace.1: fix format of -P description

* strace.1 (-P): Write trailing using regular font.

Saruta/strace,cuviper/strace,Saruta/strace,Saruta/strace,Saruta/strace,Saruta/strace,cuviper/strace,cuviper/strace,cuviper/strace,cuviper/strace