Some fixes for chapters regexps & factors (#1636)

* regexps.qmd: fix name of 'too_few' arg

* regexps.qmd: fix typo

* factors.qmd: update argument names to .f, .x, .y

* factors.qmd: fix language

factors.qmd

@@ -177,9 +177,9 @@ It is hard to read this plot because there's no overall pattern.
 We can improve it by reordering the levels of `relig` using `fct_reorder()`.
 `fct_reorder()` takes three arguments:
 
--   `f`, the factor whose levels you want to modify.
--   `x`, a numeric vector that you want to use to reorder the levels.
--   Optionally, `fun`, a function that's used if there are multiple values of `x` for each value of `f`. The default value is `median`.
+-   `.f`, the factor whose levels you want to modify.
+-   `.x`, a numeric vector that you want to use to reorder the levels.
+-   Optionally, `.fun`, a function that's used if there are multiple values of `.x` for each value of `.f`. The default value is `median`.
 
 ```{r}
 #| fig-alt: |
@@ -231,7 +231,7 @@ Reserve `fct_reorder()` for factors whose levels are arbitrarily ordered.
 
 However, it does make sense to pull "Not applicable" to the front with the other special levels.
 You can use `fct_relevel()`.
-It takes a factor, `f`, and then any number of levels that you want to move to the front of the line.
+It takes a factor, `.f`, and then any number of levels that you want to move to the front of the line.
 
 ```{r}
 #| fig-alt: |
@@ -247,7 +247,7 @@ ggplot(rincome_summary, aes(x = age, y = fct_relevel(rincome, "Not applicable"))
 Why do you think the average age for "Not applicable" is so high?
 
 Another type of reordering is useful when you are coloring the lines on a plot.
-`fct_reorder2(f, x, y)` reorders the factor `f` by the `y` values associated with the largest `x` values.
+`fct_reorder2(.f, .x, .y)` reorders the factor `.f` by the `.y` values associated with the largest `.x` values.
 This makes the plot easier to read because the colors of the line at the far right of the plot will line up with the legend.
 
 ```{r}
@@ -287,7 +287,7 @@ Combine it with `fct_rev()` if you want them in increasing frequency so that in
 
 ```{r}
 #| fig-alt: |
-#|   A bar char of marital status ordered in from least to most common:
+#|   A bar char of marital status ordered from least to most common:
 #|   no answer (~0), separated (~1,000), widowed (~2,000), divorced 
 #|   (~3,000), never married (~5,000), married (~10,000).
 gss_cat |>

regexps.qmd

@@ -265,7 +265,7 @@ df |>
   )
 ```
 
-If the match fails, you can use `too_short = "debug"` to figure out what went wrong, just like `separate_wider_delim()` and `separate_wider_position()`.
+If the match fails, you can use `too_few = "debug"` to figure out what went wrong, just like `separate_wider_delim()` and `separate_wider_position()`.
 
 ### Exercises
 
@@ -336,7 +336,7 @@ That lets you avoid one layer of escaping:
 str_view(x, r"{\\}")
 ```
 
-If you're trying to match a literal `.`, `$`, `|`, `*`, `+`, `?`, `{`, `}`, `(`, `)`, there's an alternative to using a backslash escape: you can use a character class: `[.]`, `[$]`, `[|]`, \...
+If you're trying to match a literal `.`, `$`, `|`, `*`, `+`, `?`, `{`, `}`, `(`, `)`, there's an alternative to using a backslash escape: you can use a character class: `[.]`, `[$]`, `[|]`, ...
 all match the literal values.
 
 ```{r}