update EMBIGGEN.md

- fix codeblocks
- fix toc
- use admonitions

docs/features/EMBIGGEN.md

@@ -43,7 +43,7 @@ it's similar to that, except it can work up to an arbitrarily large size
 has extra logic to re-run any number of the tile sub-sections of the image
 if for example a small part of a huge run got messed up.
 
-## Usage
+### Usage
 
 `-embiggen <scaling_factor> <esrgan_strength> <overlap_ratio OR overlap_pixels>`
 
@@ -100,7 +100,9 @@ Tiles are numbered starting with one, and left-to-right,
 top-to-bottom.  So, if you are generating a 3x3 tiled image, the
 middle row would be `4 5 6`.
 
-## Example Usage
+### Examples
+
+!!! example ""
 
     Running Embiggen with 512x512 tiles on an existing image, scaling up by a factor of 2.5x;
     and doing the same again (default ESRGAN strength is 0.75, default overlap between tiles is 0.25):
@@ -112,6 +114,8 @@ invoke > a photo of a forest at sunset -s 100 -W 512 -H 512 -I outputs/forest.pn
 
     If your starting image was also 512x512 this should have taken 9 tiles.
 
+!!! example ""
+
     If there weren't enough clouds in the sky of that forest you just made
     (and that image is about 1280 pixels (512*2.5) wide A.K.A. three
     512x512 tiles with 0.25 overlaps wide) we can replace that top row of
@@ -128,17 +132,17 @@ look up the original prompt and provide an initial image. Just use the
 syntax `!fix path/to/file.png <embiggen>`. For example, you can rewrite the
 previous command to look like this:
 
-~~~~
+```bash
 invoke> !fix ./outputs/000002.seed.png -embiggen_tiles 1 2 3
-~~~~
+```
 
 A new file named `000002.seed.fixed.png` will be created in the output directory. Note that
 the `!fix` command does not replace the original file, unlike the behavior at generate time.
 You do not need to provide the prompt, and `!fix` automatically selects a good strength for
 embiggen-ing.
 
+!!! note
 
-**Note**
     Because the same prompt is used on all the tiled images, and the model
     doesn't have the context of anything outside the tile being run - it
     can end up creating repeated pattern (also called 'motifs') across all