Spanish improvements (#1360)

- Corrected a typo in one of the images in Spanish
- Improved the look of one of the images in Spanish

Co-authored-by: Diego Sejas-Viscarra <dsejas.math@m.me>

LEEME.md

@@ -129,6 +129,7 @@ La covertura del estándar Unicode hace de Fira Code una gran elección para la
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