fix typos in XML doc comments, ADR docs, and test comments

docs/decisions/0001-agent-run-response.md

@@ -2,7 +2,7 @@
 # These are optional elements. Feel free to remove any of them.
 status: accepted
 contact: westey-m
-date: 2025-07-10 {YYYY-MM-DD when the decision was last updated}
+date: 2025-07-10
 deciders: sergeymenshykh, markwallace, rbarreto, dmytrostruk, westey-m, eavanvalkenburg, stephentoub
 consulted:
 informed:
@@ -139,7 +139,7 @@ Therefore something like `AgentResponse.Text` which also aggregates all `TextCon
 
 #### Option 1.2 Presence of Secondary Content is determined by a runtime parameter
 
-We can allow callers to choose whether to include secondary content in the list of reponse messages.
+We can allow callers to choose whether to include secondary content in the list of response messages.
 Open Question: Do we allow secondary content to use `TextContent` types?
 
 ```csharp

docs/decisions/0006-userapproval.md

@@ -2,7 +2,7 @@
 # These are optional elements. Feel free to remove any of them.
 status: accepted
 contact: westey-m
-date: 2025-09-12 {YYYY-MM-DD when the decision was last updated}
+date: 2025-09-12
 deciders: sergeymenshykh, markwallace-microsoft, rogerbarreto, dmytrostruk, westey-m, eavanvalkenburg, stephentoub, peterychang
 consulted: 
 informed: 

docs/decisions/0009-support-long-running-operations.md

@@ -1089,7 +1089,7 @@ public class ChatOptions
 
 ##### 6.1.5 Continuation Token of a Custom Type
 
-The option is similar the the "6.1.3 Continuation Token of System.ClientModel.ContinuationToken Type" option but suggests using a 
+The option is similar to the "6.1.3 Continuation Token of System.ClientModel.ContinuationToken Type" option but suggests using a 
 custom type for the continuation token instead of the `System.ClientModel.ContinuationToken` type.
 
 **Pros**

dotnet/src/Microsoft.Agents.AI.Anthropic/AnthropicClientExtensions.cs

@@ -20,7 +20,7 @@ public static class AnthropicClientExtensions
     /// <summary>
     /// Creates a new AI agent using the specified model and options.
     /// </summary>
-    /// <param name="client">An Anthropic <see cref="IAnthropicClient"/> to use with the agent..</param>
+    /// <param name="client">An Anthropic <see cref="IAnthropicClient"/> to use with the agent.</param>
     /// <param name="model">The model to use for chat completions.</param>
     /// <param name="instructions">The instructions for the AI agent.</param>
     /// <param name="name">The name of the AI agent.</param>
@@ -74,7 +74,7 @@ public static ChatClientAgent AsAIAgent(
     /// <summary>
     /// Creates an AI agent from an <see cref="IAnthropicClient"/> using the Anthropic Chat Completion API.
     /// </summary>
-    /// <param name="client">An Anthropic <see cref="IAnthropicClient"/> to use with the agent..</param>
+    /// <param name="client">An Anthropic <see cref="IAnthropicClient"/> to use with the agent.</param>
     /// <param name="options">Full set of options to configure the agent.</param>
     /// <param name="clientFactory">Provides a way to customize the creation of the underlying <see cref="IChatClient"/> used by the agent.</param>
     /// <param name="loggerFactory">Optional logger factory for enabling logging within the agent.</param>

dotnet/src/Microsoft.Agents.AI.Purview/IScopedContentProcessor.cs

@@ -17,7 +17,7 @@ internal interface IScopedContentProcessor
     /// Process a list of messages.
     /// The list of messages should be a prompt or response.
     /// </summary>
-    /// <param name="messages">A list of <see cref="ChatMessage"/> objects sent to the agent or received from the agent..</param>
+    /// <param name="messages">A list of <see cref="ChatMessage"/> objects sent to the agent or received from the agent.</param>
     /// <param name="sessionId">The session where the messages were sent.</param>
     /// <param name="activity">An activity to indicate prompt or response.</param>
     /// <param name="purviewSettings">Purview settings containing tenant id, app name, etc.</param>

dotnet/tests/Microsoft.Agents.AI.UnitTests/ChatClient/ChatClientAgentTests.cs

@@ -464,7 +464,7 @@ public async Task RunAsyncSetsAuthorNameOnAllResponseMessagesAsync(string? autho
     }
 
     /// <summary>
-    /// Verify that RunAsync works with existing session and can retreive messages if the session has a ChatHistoryProvider.
+    /// Verify that RunAsync works with existing session and can retrieve messages if the session has a ChatHistoryProvider.
     /// </summary>
     [Fact]
     public async Task RunAsyncRetrievesMessagesFromSessionWhenSessionHasChatHistoryProviderAsync()