My educated guess is that something is trying to italicize various keywords, and whatever text processing is going on isn't working, but producing bogus "In" literal text instead.
.I is the "an" macro for italics, after all.
.I is the "an" macro for italics, after all.
* https://tty0.social/@JdeBP/110427220635184435
It even prettifies those ``'' quotes, notice. This is vanilla older FreeBSD man, using groff, but actually allowing groff to do the things that it is capable of.