Fix incorrect XML doc comments in McpClient.Methods.cs

[Copilot]

Two <summary> doc comments in McpClient.Methods.cs had copy-paste errors that described the wrong behavior.

• GetPromptAsync(GetPromptRequestParams, ...): summary said "Retrieves a list of available prompts" — corrected to "Retrieves a specific prompt from the MCP server"
• SubscribeToResourceAsync(Uri, ...): summary said "Unsubscribes from a resource" and param said "to which to subscribe" — corrected to match the other SubscribeToResourceAsync overloads

Original prompt

Problem

src/ModelContextProtocol.Core/Client/McpClient.Methods.cs has several incorrect XML documentation comments:

Fix 1 — SubscribeToResourceAsync(Uri, ...) (around line 551–560)

The <summary> for the SubscribeToResourceAsync(Uri uri, ...) overload incorrectly reads:

/// <summary>
/// Unsubscribes from a resource on the server to stop receiving notifications about its changes.
/// </summary>
/// <param name="uri">The URI of the resource to which to subscribe.</param>

This is a subscribe method, not an unsubscribe method. The summary should match the other SubscribeToResourceAsync overloads, e.g.:

/// <summary>
/// Subscribes to a resource on the server to receive notifications when it changes.
/// </summary>
/// <param name="uri">The URI of the resource to subscribe to.</param>

Fix 2 — GetPromptAsync(GetPromptRequestParams, ...) (around line 282–302)

The <summary> for the GetPromptAsync(GetPromptRequestParams requestParams, ...) overload incorrectly reads:

/// <summary>
/// Retrieves a list of available prompts from the server.
/// </summary>

This is the raw-params overload of GetPromptAsync — it retrieves a single specific prompt, not a list of prompts. The summary should be corrected to something like:

/// <summary>
/// Retrieves a specific prompt from the MCP server.
/// </summary>

Please fix both of these doc comment issues. Do not change any code logic, only the XML documentation comments.

This pull request was created from Copilot chat.

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