Update r style guide

PiperOrigin-RevId: 988536167

Rguide.md

@@ -11,6 +11,10 @@ were developed in collaboration with the internal R user community. The rest of
 this document explains Google's primary differences with the Tidyverse guide,
 and why these differences exist.
 
+Google uses the [styler](https://github.com/r-lib/styler) package on every
+checked in file to ensure code consistency and help reviewers focus on more
+important issues.
+
 ## Syntax
 
 ### Naming conventions
@@ -95,8 +99,8 @@ understand dependencies in your code. There are some exceptions to this rule.
 *   Infix functions (`%name%`) always need to be imported.
 *   Certain `rlang` pronouns, notably `.data`, need to be imported.
 *   Functions from default R packages, including `datasets`, `utils`,
-   `grDevices`, `graphics`, `stats` and `methods`. If needed, you can `@import`
-   the full package.
+    `grDevices`, `graphics`, `stats` and `methods`. If needed, you can `@import`
+    the full package.
 
 When importing functions, place the `@importFrom` tag in the Roxygen header
 above the function where the external dependency is used.
@@ -107,3 +111,9 @@ above the function where the external dependency is used.
 
 All packages should have a package documentation file, in a
 `packagename-package.R` file.
+
+## Errors
+
+### Use of bullets
+
+We prefer ASCII style bullets (`*`) to unicode when producing error messages.