Add xmldoc comment for GoToSolutionOrPRFileCommand

Author: jcansdale

src/GitHub.Exports/Commands/IGoToSolutionOrPullRequestFileCommand.cs

@@ -1,7 +1,14 @@
-using GitHub.Commands;
-
-namespace GitHub.Commands
+namespace GitHub.Commands
 {
+    /// <summary>
+    /// Navigate from a PR file to the equivalent file and location in the editor (or the reverse).
+    /// </summary>
+    /// <remarks>
+    /// This command will do one of the following depending on context.
+    /// Navigate from PR file diff to the working file in the solution.
+    /// Navigate from the working file in the solution to the PR file diff.
+    /// Navigate from an editable diff (e.g. 'View Changes in Solution') to the editor view.
+    /// </remarks>
     public interface IGoToSolutionOrPullRequestFileCommand : IVsCommand
     {
     }

src/GitHub.VisualStudio/Commands/GoToSolutionOrPullRequestFileCommand.cs

@@ -14,6 +14,15 @@
 
 namespace GitHub.Commands
 {
+    /// <summary>
+    /// Navigate from a PR file to the equivalent file and location in the editor (or the reverse).
+    /// </summary>
+    /// <remarks>
+    /// This command will do one of the following depending on context.
+    /// Navigate from PR file diff to the working file in the solution.
+    /// Navigate from the working file in the solution to the PR file diff.
+    /// Navigate from an editable diff (e.g. 'View Changes in Solution') to the editor view.
+    /// </remarks>
     [Export(typeof(IGoToSolutionOrPullRequestFileCommand))]
     public class GoToSolutionOrPullRequestFileCommand : VsCommand, IGoToSolutionOrPullRequestFileCommand
     {