Minor: Improve ObjectStoreUrl docs + examples (#10619)

Author: alamb

datafusion/execution/src/object_store.rs

@@ -27,14 +27,32 @@ use object_store::ObjectStore;
 use std::sync::Arc;
 use url::Url;
 
-/// A parsed URL identifying a particular [`ObjectStore`]
+/// A parsed URL identifying a particular [`ObjectStore`] instance
+///
+/// For example:
+/// * `file://` for local file system
+/// * `s3://bucket` for AWS S3 bucket
+/// * `oss://bucket` for Aliyun OSS bucket
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct ObjectStoreUrl {
     url: Url,
 }
 
 impl ObjectStoreUrl {
     /// Parse an [`ObjectStoreUrl`] from a string
+    ///
+    /// # Example
+    /// ```
+    /// # use url::Url;
+    /// # use datafusion_execution::object_store::ObjectStoreUrl;
+    /// let object_store_url = ObjectStoreUrl::parse("s3://bucket").unwrap();
+    /// assert_eq!(object_store_url.as_str(), "s3://bucket/");
+    /// // can also access the underlying `Url`
+    /// let url: &Url = object_store_url.as_ref();
+    /// assert_eq!(url.scheme(), "s3");
+    /// assert_eq!(url.host_str(), Some("bucket"));
+    /// assert_eq!(url.path(), "/");
+    /// ```
     pub fn parse(s: impl AsRef<str>) -> Result<Self> {
         let mut parsed =
             Url::parse(s.as_ref()).map_err(|e| DataFusionError::External(Box::new(e)))?;