Implement Into<CaptureError> for the default server function error type (#4205)

* implement Into<CaptureError> for the server function error type

* document the server function error type

* fix tests

packages/playwright-tests/nested-suspense/src/lib.rs

@@ -83,7 +83,7 @@ pub struct Content {
 }
 
 #[server]
-async fn server_content(id: usize) -> Result<Content, ServerFnError> {
+async fn server_content(id: usize) -> ServerFnResult<Content> {
     let content_tree = [
         Content {
             title: "The robot says hello world".to_string(),

packages/playwright-tests/nested-suspense/src/ssg.rs

@@ -25,6 +25,6 @@ fn main() {
 }
 
 #[server(endpoint = "static_routes")]
-async fn static_routes() -> Result<Vec<String>, ServerFnError> {
+async fn static_routes() -> ServerFnResult<Vec<String>> {
     Ok(vec!["/".to_string()])
 }