Updated all, any, none

Merged them with their by counterparts.

snippets/all.md

@@ -1,13 +1,15 @@
 ### all
 
-Returns `true` if all elements in a collection are truthy, `false` otherwise.
+Returns `true` if the provided predicate function returns `true` for all elements in a collection, `false` otherwise.
 
-Use `Array.every(Boolean)` to test if all elements in the collection are truthy.
+Use `Array.every()` to test if all elements in the collection return `true` based on `fn`.
+Omit the second argument, `fn`, to use `Boolean` as a default.
 
 ```js
-const all = arr => arr.every(Boolean);
+const all = (arr, fn = Boolean) => arr.every(fn);
 ```
 
 ```js
+all([4, 2, 3], x => x > 1); // true
 all([1, 2, 3]); // true
 ```