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doc: document array .any() and .all() (#9386)

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@ -713,6 +713,15 @@ println(upper_fn) // ['HELLO', 'WORLD']
`it` is a builtin variable which refers to element currently being processed in filter/map methods.
Additionally, `.any()` and `.all()` can be used to conveniently test
for elements that satisfy a condition.
```v
nums := [1, 2, 3]
println(nums.any(it == 2)) // true
println(nums.all(it >= 2)) // false
```
#### Multidimensional Arrays
Arrays can have more than one dimension.