Merge pull request #613 from Dasharo/Psotas-fix-boot-logo-replacment-…

…instructions

fix docs/guides/logo-customization.md required resolution is recommended

docs/guides/logo-customization.md

@@ -11,13 +11,17 @@ replacing the logo.
 The image file must fulfill a number of requirements:
 
 - Bitmap (BMP file)
-- up to 577×432 resolution
+- Recommended resolution up to 577×432, but can be higher if it fits in the
+`BOOTSPLASH` region.
 - indexed or 24bit RGB colors
 - uncompressed
 - preferably containing a simple logo on a black background with no additional
 padding.
 - make sure it is properly formatted. To be sure, use the command:
-`convert -background None custom_logo.bmp BMP3:logo.bmp`
+
+```bash
+convert -background None custom_logo.bmp BMP3:logo.bmp
+```
 
 ## Replace logo in an existing image