docs: Updated medusa docs a little bit

docs/medusa/creating-a-medusa.md

@@ -156,7 +156,7 @@ This section will guide you through how to create a simple custom medusa. You ca
     <ItemGroup>
         <!-- Base medusa package. You MUST reference this in order to have a working medusa -->
         <!-- Also, this package comes from MyGet, which requires you to have a NuGet.Config file next to your .csproj -->
-        <PackageReference Include="Nadeko.Medusa" Version="4.3.9">
+        <PackageReference Include="Nadeko.Medusa" Version="5.*">
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
 
@@ -180,8 +180,7 @@ This section will guide you through how to create a simple custom medusa. You ca
 ```
 - Create a `MySnek.cs` file and add the following contents
 ```cs
-using Nadeko.Snake;
-using NadekoBot;
+using NadekoBot.Medusa;
 using Discord;
 
 public sealed class MySnek : Snek
@@ -199,14 +198,15 @@ public sealed class MySnek : Snek
     }
 }
 ```
-- Create `res.yml` and `cmds.yml` files with the following contents
-`res.yml`
+- Create `res.yml` and `cmds.yml` files with the following contents  
+
+`res.yml`  
 ```yml
 medusa.description: "This is my medusa's description"
 hello: "Hello {0}, from res.yml!"
 ```
 
-`cmds.yml`
+`cmds.yml`  
 ```yml
 hello: 
   desc: "This is a basic hello command"