Point users to support email address

Author: jcansdale

src/GitHub.App/Services/PullRequestService.cs

@@ -321,7 +321,7 @@ public IObservable<string> ExtractFile(
                     }
                     catch (NotFoundException ex)
                     {
-                        throw new NotFoundException($"The Pull Request file failed to load. Please check your network connection and click refresh to try again.", ex);
+                        throw new NotFoundException($"The Pull Request file failed to load. Please check your network connection and click refresh to try again. If this issue persists, please let us know at [email protected]", ex);
                     }
                 }
 

src/GitHub.InlineReviews/Services/PullRequestSessionService.cs

@@ -132,7 +132,7 @@ public async Task<string> GetPullRequestMergeBase(ILocalRepositoryModel reposito
             }
             catch (NotFoundException ex)
             {
-                throw new NotFoundException("The Pull Request failed to load. Please check your network connection and click refresh to try again.", ex);
+                throw new NotFoundException("The Pull Request failed to load. Please check your network connection and click refresh to try again. If this issue persists, please let us know at [email protected]", ex);
             }
 
             return mergeBaseCache[key] = mergeBase;