Improve docs

Author: brendt

src/Web/Documentation/content/main/1-framework/15-primitive-utilities.md

@@ -7,21 +7,19 @@ Tempest comes with a handful of classes that improve working with primitive type
 
 ## Strings
 
-The `StringHelper` class wraps a normal string, and provides a fluent API to manipulate that string. Note that all these methods are immutable, so every call creates a new instance of `StringHelper` without modifying the original one.
+The `ImmutableString` and `MutableString` classes wraps a normal string, and provide a fluent API to manipulate that string.
 
 ```php
-use Tempest\Support\StringHelper;
+use Tempest\Support\Str\ImmutableString;
 
-$slug = (new StringHelper('https://tempestphp.com/docs/framework/14-primitive-helpers'))
+$slug = (new ImmutableString('https://tempestphp.com/docs/framework/14-primitive-helpers'))
     ->trim('/')
     ->afterLast('/')
     ->replaceRegex('/\d+-/', '')
     ->toString();
-
-// primitive-helpers
 ```
 
-Note that you can also use the `str()` helper function instead of manually creating a `StringHelper` object:
+Note that you can also use the `str()` helper function, which is a shorthand for `ImmutableString`:
 
 ```php
 use function Tempest\Support\str;
@@ -33,24 +31,24 @@ if (! $path->startsWith('/docs')) {
 }
 ```
 
-The `StringHelper` encapsulates many of PHP's built-in string functions, as well as several regex-based functions. You can check out the [full API on GitHub](https://github.com/tempestphp/tempest-framework/blob/main/src/Tempest/Support/src/StringHelper.php).
+These string helpers encapsulate many of PHP's built-in string functions, as well as several regex-based functions. You can check out the [full API on GitHub](https://github.com/tempestphp/tempest-framework/blob/main/src/Tempest/Support/src/Str/ManipulatesString.php).
 
 ## Arrays
 
-The `ArrayHelper` class wraps a normal array, and provides a fluent API to manipulate it. Note that all these methods are immutable, so every call creates a new instance of `ArrayHelper` without modifying the original one.
+The `ImmutableArray` and `MutableArray` classes wrap an array, and provide a fluent API to manipulate it.
 
 ```php
-use Tempest\Support\ArrayHelper;
+use Tempest\Support\Arr\ImmutableArray;
 
-$items = (new ArrayHelper(glob(__DIR__ . '/Content/*.md')))
+$items = (new ImmutableArray(glob(__DIR__ . '/Content/*.md')))
     ->reverse()
     ->map(function (string $path) {
         // …
     })
     ->mapTo(BlogPost::class);
 ```
 
-Note that you can also use the `arr()` helper function instead of manually creating a `ArrayHelper` object:
+Note that you can also use the `arr()` helper function instead of manually creating an `ImmutableArray` object:
 
 ```php
 use function Tempest\Support\arr;
@@ -66,7 +64,7 @@ $codeBlocks = arr(glob(__DIR__ . '/*.md'))
     ->toArray();
 ```
 
-You can check out the [full API on GitHub](https://github.com/tempestphp/tempest-framework/blob/main/src/Tempest/Support/src/ArrayHelper.php).
+You can check out the [full API on GitHub](https://github.com/tempestphp/tempest-framework/blob/main/src/Tempest/Support/src/Arr/ManipulatesArray.php).
 
 ## Enums