Improve R documentation (#33594)

Release Notes:

- N/A

docs/src/languages/r.md

@@ -1,9 +1,14 @@
 # R
 
-R support is available through the [R extension](https://github.com/ocsmit/zed-r).
+R support is available via multiple R Zed extensions:
 
-- Tree-sitter: [r-lib/tree-sitter-r](https://github.com/r-lib/tree-sitter-r)
-- Language-Server: [REditorSupport/languageserver](https://github.com/REditorSupport/languageserver)
+- [ocsmit/zed-r](https://github.com/ocsmit/zed-r)
+
+  - Tree-sitter: [r-lib/tree-sitter-r](https://github.com/r-lib/tree-sitter-r)
+  - Language-Server: [REditorSupport/languageserver](https://github.com/REditorSupport/languageserver)
+
+- [posit-dev/air](https://github.com/posit-dev/air/tree/main/editors/zed)
+  - Language-Server: [posit-dev/air](https://github.com/posit-dev/air)
 
 ## Installation
 
@@ -15,7 +20,7 @@ install.packages("languageserver")
 install.packages("lintr")
 ```
 
-3. Install the [R Zed extension](https://github.com/ocsmit/zed-r) through Zed's extensions manager.
+3. Install the [ocsmit/zed-r](https://github.com/ocsmit/zed-r) through Zed's extensions manager.
 
 For example on macOS:
 
@@ -28,7 +33,65 @@ Rscript -e 'packageVersion("languageserver")'
 Rscript -e 'packageVersion("lintr")'
 ```
 
-## Ark Installation
+## Configuration
+
+### Linting
+
+`REditorSupport/languageserver` bundles support for [r-lib/lintr](https://github.com/r-lib/lintr) as a linter. This can be configured via the use of a `.lintr` inside your project (or in your home directory for global defaults).
+
+```r
+linters: linters_with_defaults(
+    line_length_linter(120),
+    commented_code_linter = NULL
+  )
+exclusions: list(
+    "inst/doc/creating_linters.R" = 1,
+    "inst/example/bad.R",
+    "tests/testthat/exclusions-test"
+  )
+```
+
+Or exclude it from linting anything,
+
+```r
+exclusions: list(".")
+```
+
+See [Using lintr](https://lintr.r-lib.org/articles/lintr.html) for a complete list of options,
+
+### Formatting
+
+`REditorSupport/languageserver` bundles support for [r-lib/styler](https://github.com/r-lib/styler) as a formatter. See [Customizing Styler](https://cran.r-project.org/web/packages/styler/vignettes/customizing_styler.html) for more information on how to customize its behavior.
+
+### REditorSupport/languageserver Configuration
+
+You can configure the [R languageserver settings](https://github.com/REditorSupport/languageserver#settings) via Zed Project Settings `.zed/settings.json` or Zed User Settings `~/.config/zed/settings.json`:
+
+For example to disable Lintr linting and suppress code snippet suggestions (both enabled by default):
+
+```json
+{
+  "lsp": {
+    "r_language_server": {
+      "settings": {
+        "r": {
+          "lsp": {
+            "diagnostics": false,
+            "snippet_support": false
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+<!--
+TBD: R REPL Docs
+
+## REPL
+
+### Ark Installation
 
 To use the Zed REPL with R you need to install [Ark](https://github.com/posit-dev/ark), an R Kernel for Jupyter applications.
 You can down the latest version from the [Ark GitHub Releases](https://github.com/posit-dev/ark/releases) and then extract the `ark` binary to a directory in your `PATH`.
@@ -56,6 +119,4 @@ unzip ark-latest-linux.zip ark
 sudo mv /tmp/ark /usr/local/bin/
 ```
 
-<!--
-TBD: R REPL Docs
 -->