(trivial) strange man page markup breaks yelp

[andypiper]

I noticed that launching yelp / GNOME Help and entering man mosquitto.conf into the search box, the man page loads fine, but in the synopsis section is says:

mosquitto.conf kx

I'm not sure where the kx is coming from but it looks like the markup in the man page itself has
\fBmosquitto.conf\fR \kx

(I'm not sure what this means in nroff/groff notation - it could be valid, making this potentially a yelp issue, or a docbook2man issue... it's just.... weird)

[Roger Light (roger.light)]

From http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.47.8354&rep=rep1&type=pdf :

"11.3. Mark horizontal place. The escape sequence \kx will cause the current horizontal position in the input line
to be stored in register x. As an example, the construction \kxword \h´  \nxu+2u´word will embolden word by
backing up to almost its beginning and overprinting it, resulting in word word."

Note that the x there is in italics and is used to choose a register, but I'm going to assume \kx is valid, although seemingly pretty useless in this case.

[Roger Light (roger.light)]

I'm not going to do anything about this - I think it's a bug in yelp.