Fix plaintext typos (#1196)

iteration.qmd

@@ -687,7 +687,7 @@ Now when you come back to this problem in the future, you can read in a single c
 unlink("gapminder.csv")
 ```
 
-If you're working in a project, we'd suggest calling the file that does this sort of data prep work something like `0-cleanup.R.` The `0` in the file name suggests that this should be run before anything else.
+If you're working in a project, we'd suggest calling the file that does this sort of data prep work something like `0-cleanup.R`. The `0` in the file name suggests that this should be run before anything else.
 
 If your input data files change over time, you might consider learning a tool like [targets](https://docs.ropensci.org/targets/) to set up your data cleaning code to automatically re-run whenever one of the input files is modified.
 

joins.qmd

@@ -79,7 +79,7 @@ For example:
 -   `flights$tailnum` is a foreign key that corresponds to the primary key `planes$tailnum`.
 -   `flights$carrier` is a foreign key that corresponds to the primary key `airlines$carrier`.
 -   `flights$origin` is a foreign key that corresponds to the primary key `airports$faa`.
--   `flights$dest` is a foreign key that corresponds to the primary key `airports$faa` .
+-   `flights$dest` is a foreign key that corresponds to the primary key `airports$faa`.
 -   `flights$origin`-`flights$time_hour` is a compound foreign key that corresponds to the compound primary key `weather$origin`-`weather$time_hour`.
 
 These relationships are summarized visually in @fig-flights-relationships.

workflow-pipes.qmd

@@ -1,4 +1,4 @@
-# Workflow: Pipes {#sec-workflow-pipes}
+# Workflow: pipes {#sec-workflow-pipes}
 
 ```{r}
 #| results: "asis"