Adjust headings to prevent a double title being generated

Author: cmitu

docs/Memory-Split.md

@@ -1,9 +1,8 @@
-## Memory Split
 
 Raspberry Pi systems use a shared memory architecture, allocating memory for GPU (2d, 3d and video) and CPU tasks. It is possible to manually set this allocation, however there is typically no reason to adjust it as the defaults are correct. As per the [official documentation](https://www.raspberrypi.org/documentation/computers/config_txt.html#memory-options):
 > Unlike GPU's found on x86 machines, where increasing memory can improve 3D performance, the architecture of the VideoCore means **there is no performance advantage from specifying values larger than is necessary, and in fact it can harm performance**.
 
-### Adjusting the Memory Split
+## Adjusting the Memory Split
 
 **NOTE**: Please be mindful of the platform-specific notes below, before changing any settings.
 
@@ -15,15 +14,15 @@ You can choose a split from 16/32/64/128/256 (the settings may be different depe
 
 ![gpu](https://cloud.githubusercontent.com/assets/10035308/10713855/53c539b8-7a93-11e5-9016-2117e8a890ad.png)
 
-### Raspberry Pi 4
+## Raspberry Pi 4
 
 On the Raspberry Pi 4 the 3D component of the GPU has its own memory management unit (MMU), and does not use memory from the `gpu_mem` allocation. Instead memory is allocated dynamically within Linux. Increasing this amount can ***harm*** emulation performance.
 
-#### Kodi
+### Kodi
 
 Previously, the FKMS driver still utilised the memory split for certain media tasks, e.g., hardware video decoding for 4K (HEVC) video. If you have issues with 4K videos in Kodi, upgrade to the latest kernel/firmware, for example via _RetroPie-Setup -> Configuration / Tools -> raspbiantools -> Upgrade Raspbian packages_.
 
-### Raspberry Pi 0-3
+## Raspberry Pi 0-3
 
 If you don't use the RetroPie provided image, and you install using the [manual installation method](Manual-Installation), you have to adjust the memory split settings manually before installation to reserve at enough video memory for running Emulationstation without problems. The default values used by the RetroPie image are:
 ~~~~