docs: Fix formatting based on review comments

Author: doublegate

docs/library/rustynes.md

@@ -9,37 +9,41 @@ It is extremely portable and deterministic, making it a reliable choice for netp
 ### Author/License
 
 The RustyNES core has been authored by
+
 - DoubleGate
 
 The RustyNES core is licensed under
+
 - MIT OR Apache-2.0
 
 A summary of the licenses behind RetroArch and its cores can be found [here](../development/licenses.md).
 
 ## Extensions
 
 Content that can be loaded by the RustyNES core have the following file extensions:
+
 - .nes
 
 ## Databases
 
 RetroArch database(s) that are associated with the RustyNES core:
+
 - [Nintendo - Nintendo Entertainment System](https://github.com/libretro/libretro-database/blob/master/rdb/Nintendo%20-%20Nintendo%20Entertainment%20System.rdb)
 
 ## Features
 
 Frontend-level settings or features that the RustyNES core respects.
 
 | Feature           | Supported |
-|-------------------|-----------|
+|-------------------|:---------:|
 | Restart           | ✔         |
 | Screenshots       | ✔         |
 | Saves             | ✔         |
 | States            | ✔         |
 | Rewind            | ✔         |
 | Netplay           | ✔         |
 | Core Options      | ✕         |
-| RetroAchievements | ✔         |
+| [Memory Monitoring (achievements)](../guides/memorymonitoring.md) | ✔         |
 | RetroArch Cheats  | ✕         |
 | Native Cheats     | ✕         |
 | Controls          | ✔         |
@@ -67,6 +71,8 @@ No BIOS files are strictly required to use the RustyNES core.
 
 ## Joypad
 
+![](../image/controller/nes.png)
+
 | User 1 - 2 input descriptors | RetroPad Inputs                           |
 |------------------------------|-------------------------------------------|
 | B                            | ![](../image/retropad/retro_b.png)        |