Update snippet descriptions

snippets/geometricProgression.md

@@ -13,7 +13,7 @@ Returns an error if `step` equals `1`.
 ```js
 const geometricProgression = (end, start = 1, step = 2) =>
   Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map(
-    (v, i) => start * step ** i
+    (_, i) => start * step ** i
   );
 ```