Apply suggestions from code review

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: paulb777

FirebaseAI/Sources/Types/Public/URLContextMetadata.swift

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-/// Metadata related to ``URLContextTool``.
+/// Metadata related to the ``Tool/urlContext()`` tool.
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 public struct URLContextMetadata: Sendable, Hashable {
   /// List of URL metadata used to provide context to the Gemini model.

FirebaseAI/Sources/Types/Public/URLMetadata.swift

@@ -14,8 +14,7 @@
 
 import Foundation
 
-/// The number of tokens in the results from tool executions, which are provided back to the model
-/// as input.
+/// Metadata for a single URL retrieved by the `urlContext` tool.
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 public struct URLMetadata: Sendable, Hashable {
   /// Status of the URL retrieval.