Update git-database.md (#2247)

Author: ch1seL

docs/git-database.md

@@ -17,12 +17,12 @@ var tag = new NewTag {
         Date = DateTime.UtcNow
     }	
 };
-var result = await client.Git.Tags.Create("octokit", "octokit.net", tag);
+var result = await client.Git.Tag.Create("octokit", "octokit.net", tag);
 Console.WriteLine("Created a tag for {0} at {1}", result.Tag, result.Sha);
 ```
 
 Or you can fetch an existing tag from the API:
 
 ```csharp
-var tag = await client.Git.Tags.Get("octokit", "octokit.net", "v1.0.0");
+var tag = await client.Git.Tag.Get("octokit", "octokit.net", "v1.0.0");
 ```