docs: Remove incompatible table format
Sadly sphinx doesn't support pipe tables in markdown at the minute.
Let's use a bullet-point list instead.
@@ -20,16 +20,17 @@ Accommodate the values above to your own needs (ex: ext3 / ext4).
## GPU memory
-| Variable | Details |
-|----------------|---------------------------------------------------------------------|
-| `GPU_MEM` | GPU memory in megabyte. Sets the memory split between the ARM and |
-| | GPU. ARM gets the remaining memory. Min 16. Default 64. |
-| `GPU_MEM_256` | GPU memory in megabyte for the 256MB Raspberry Pi. Ignored by the |
-| | 512MB RP. Overrides gpu_mem. Max 192. Default not set. |
-| `GPU_MEM_512` | GPU memory in megabyte for the 512MB Raspberry Pi. Ignored by the |
-| | 256MB RP. Overrides gpu_mem. Max 448. Default not set. |
-| `GPU_MEM_1024` | GPU memory in megabyte for the 1024MB Raspberry Pi. Ignored by the |
-| | 256MB/512MB RP. Overrides gpu_mem. Max 944. Default not set. |
+* `GPU_MEM`: GPU memory in megabyte. Sets the memory split between the ARM and
+ GPU. ARM gets the remaining memory. Min 16. Default 64.
+
+* `GPU_MEM_256`: GPU memory in megabyte for the 256MB Raspberry Pi. Ignored by
+ the 512MB RP. Overrides gpu_mem. Max 192. Default not set.
+
+* `GPU_MEM_512`: GPU memory in megabyte for the 512MB Raspberry Pi. Ignored by
+ the 256MB RP. Overrides gpu_mem. Max 448. Default not set.
+
+* `GPU_MEM_1024`: GPU memory in megabyte for the 1024MB Raspberry Pi. Ignored by
+ the 256MB/512MB RP. Overrides gpu_mem. Max 944. Default not set.
## Add purchased license codecs
