Fix installation note (#162)

**What changes are proposed in this pull request?**
* Fix note occurring during installation

Closes #161 


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Pre-review Checklist (if item does not apply, mark is as complete)
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- [x] PR branch has pulled the most recent updates from master branch:
`usethis::pr_merge_main()`
- [x] If a bug was fixed, a unit test was added.
- [x] If a new `ard_*()` function was added, it passes the ARD
structural checks from `cards::check_ard_structure()`.
- [x] If a new `ard_*()` function was added, `set_cli_abort_call()` has
been set.
- [x] If a new `ard_*()` function was added and it depends on another
package (such as, `broom`), `is_pkg_installed("broom", reference_pkg =
"cardx")` has been set in the function call and the following added to
the roxygen comments: `@examplesIf
do.call(asNamespace("cardx")$is_pkg_installed, list(pkg = "broom"",
reference_pkg = "cardx"))`
- [x] Code coverage is suitable for any new functions/features
(generally, 100% coverage for new code): `devtools::test_coverage()`

Reviewer Checklist (if item does not apply, mark is as complete)

- [ ] If a bug was fixed, a unit test was added.
- [ ] Code coverage is suitable for any new functions/features:
`devtools::test_coverage()`

When the branch is ready to be merged:
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- [ ] Approve Pull Request
- [ ] Merge the PR. Please use "Squash and merge" or "Rebase and merge".

R/ard_continuous.survey.design.R

@@ -193,7 +193,7 @@ accepted_svy_stats <- function(expand_quantiles = TRUE) {
   else if (stat_name %in% "max") args <- list(FUN = \(x, design, na.rm, ...) max(design$variables[[all.vars(x)]], na.rm = na.rm))
   # define functions for the quantiles
   else if (stat_name %in% c("median", paste0("p", 0:100))) {
-    quantile <- ifelse(stat_name %in% "median", 0.5, substr(stat_name, 2, nchar(stat_name)) |> as.numeric() %>% `/`(100))
+    quantile <- ifelse(stat_name %in% "median", 0.5, as.numeric(substr(stat_name, 2, nchar(stat_name))) / 100)
     # univariate results are returned in a different format from stratified.
     args <-
       if (is_empty(by)) list(FUN = \(...) survey::svyquantile(...)[[1]], quantiles = quantile)