Print markdown within r notebook code chunks

r-markdown-heads.R

# Needs `, results='asis'` and two spaces before the trailing newline
```{r occupations_by_vismin.R, echo=TRUE, message=FALSE, warning=FALSE, results='asis'}

for(thing in list_of_things){

  cat("\n###", thing, "\n")
  cat("  \n")

}  
```