fix typo (#71)

vignettes/custom.Rmd

@@ -36,7 +36,7 @@ Answering these questions can help you better understand whether your problem is
 
 ## The prompt directory
 
-The easiest way to write a new pal that's loaded every time you load R is to add a markdown file to the _prompt directory_. The prompt directory is a folder of markdown files that serves as a library of possible pals. By default, the prompt directory lives at `~/.config/pal`, but that default can be changed by adding a `.pal_dir` option in your `.Rprofile` using `options(pal_dir = some/dir/`). `directory_path()` returns the path to the directory, `directory_set()` changes it, `directory_list()` enumerates all of the prompts that currently live in it, and `directory_load()` registers/refreshes all of the prompts in the directory with the pal package.
+The easiest way to write a new pal that's loaded every time you load R is to add a markdown file to the _prompt directory_. The prompt directory is a folder of markdown files that serves as a library of possible pals. By default, the prompt directory lives at `~/.config/pal`, but that default can be changed by adding a `.pal_dir` option in your `.Rprofile` using `options(.pal_dir = some/dir/`). `directory_path()` returns the path to the directory, `directory_set()` changes it, `directory_list()` enumerates all of the prompts that currently live in it, and `directory_load()` registers/refreshes all of the prompts in the directory with the pal package.
 
 To create a new pal, add a prompt to pal's prompt directory with `prompt_new()`. You'll need to supply a `role` (a single keyword describing what the pal does, like `"roxygen"`) and an `interface` describing how the pal will interact with the selection (one of `"replace"`, `"prefix"`, or `"suffix"`). You can also "pre-fill" the contents of the prompt by supplying a file path with the `contents` argument.