update docblocks

src/Psl/Arr/flip.php

@@ -12,8 +12,8 @@ use Psl;
  *
  * Examples:
  *
- *      Iter\flip(['a' => 1, 'b' => 2, 'c' => 3])
- *      => Iter(1 => 'a', 2 => 'b', 3 => 'c')
+ *      Arr\flip(['a' => 1, 'b' => 2, 'c' => 3])
+ *      => Arr(1 => 'a', 2 => 'b', 3 => 'c')
  *
  * @psalm-template Tk of array-key
  * @psalm-template Tv of array-key

src/Psl/Arr/group_by.php

@@ -16,13 +16,16 @@ use Psl\Str;
  *
  * Example:
  *
- *      Arr\group_by(Iter\range(0, 10), fn($i) => $i < 2 ? null : $i + 5)
+ *      Arr\group_by(
+ *          [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+ *          fn($i) => $i < 2 ? null : $i + 5
+ *      )
  *      => Arr(
  *          7 => [2], 8 => [3], 9 => [4], 10 => [5], 11 => [6], 12 => [7], 13 => [8], 14 => [9], 15 => [10]
  *      )
  *
  *      Arr\group_by(
- *          Iter\range(0, 10),
+ *          [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
  *          fn($i) => $i < 2 ? null : ($i >= 7 ? 12 : $i +5)
  *      )
  *      => Arr(7 => [2], 8 => [3], 9 => [4], 10 => [5], 11 => [6], 12 => [7, 8, 9, 10])

src/Psl/Arr/sort_with_keys_by.php

@@ -4,8 +4,6 @@ declare(strict_types=1);
 
 namespace Psl\Arr;
 
-use Psl\Iter;
-
 /**
  * Returns a new array sorted by some scalar property of each value of the given
  * array, which is computed by the given function. If the optional

src/Psl/Arr/unique_by.php

@@ -5,8 +5,6 @@ declare(strict_types=1);
 namespace Psl\Arr;
 
 use Psl;
-use Psl\Iter;
-use Psl\Str;
 
 /**
  * Returns a new array in which each value appears exactly once, where the