Help for `detfct`, `distpdf` and other functions

[erex]

Somehow those functions are not included by pkgdown when function reference page is created. The roxygen appears to be OK in the source code for detfct. The help topic can be accessed from the console via ?detfct, but the pkgdown page for mrds functions looks like this:
https://distancesampling.org/mrds/reference/index.html

[LHMarshall]

There appears to be a distpdf.html file in the docs/reference/ folder but there is no detfct.html in that same folder. I had a try using the following code but could not rectify the above issue.

build_reference(
  pkg = ".",
  lazy = TRUE,
  examples = TRUE,
  run_dont_run = FALSE,
  seed = 1014L,
  override = list(),
  preview = FALSE,
  devel = TRUE,
  topics = c("detfct")
)

build_reference(
  pkg = ".",
  lazy = TRUE,
  examples = TRUE,
  run_dont_run = FALSE,
  seed = 1014L,
  override = list(),
  preview = FALSE,
  devel = TRUE,
  topics = c("distpdf")
)

build_reference_index(pkg = ".")

[LHMarshall]

Check if there are files with multiple functions in them? Is that causing the issue?