docs: replace legacy line‑dot‑left‑horizontal icons with unified dot icon across docs

apps/docs/content/(01-linear-structures)/binary-search/875-koko-eating-bananas.mdx

@@ -1,7 +1,7 @@
 ---
 title: '875. Koko Eating Bananas'
 description: Koko loves to eat bananas. There are n piles of bananas, the i^th pile has piles[i] bananas. The guards have gone and will come back in h hours
-icon: line-dot-left-horizontal
+icon: dot
 sidebar:
   label: 'Koko Eating Bananas'
   badge: 'Medium'