Remove unwanted R code

In the episode exploring data frames (https://swcarpentry.github.io/r-novice-gapminder/05-data-structures-part2.html), renaming row names is unnecessary as R re-names them sequentially. So, in the section 'Append to a data frame', the following code snippet can be removed.
swcarpentry · Nov 21, 2023 · 03ec9eb · 03ec9eb
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commit 03ec9eb
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diff --git a/episodes/05-data-structures-part2.Rmd b/episodes/05-data-structures-part2.Rmd
@@ -138,14 +138,6 @@ cats <- rbind(cats, cats)
 cats
 ```
 
-But now the row names are unnecessarily complicated. We can remove the rownames,
-and R will automatically re-name them sequentially:
-
-```{r}
-rownames(cats) <- NULL
-cats
-```
-
 :::::::::::::::::::::::::::::::::::::::  challenge
 
 ## Challenge 1