Work on documentation

docs/classes/dynamicsubviewport.md

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+# DynamicSubViewport
+`inherits SubViewport`
+
+### Usage
+This class functions identically to the `SubViewport` class, except it scales automatically to the root viewport.

docs/classes/scramblingtext.md

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+
+# ScramblingText
+`inherits Label`
+
+### Usage
+This class implements a 'glitch' effect for a label.
+![showcase](scramblingtext.gif)
+
+### Properties
+
+| Type | Name | Default |
+| ---- | ---- | ------- |
+| `String` | chars | `ABCDEFGHIJKLMNOPQRSTUVWXYZ124567890` |
+| `Bool` | scrambling | `False` |
+| `Float` | speed | `15.0` |
+| `Float` | duration | `1.0` |
+| `Bool` | infinite | `False` (overridden by editor_hint) |
+
+`chars`
+Stores the character set used for the scramble effect.
+
+`scrambling`
+Whether or not the scrambling effect is active.
+
+`speed`
+How many times per second the text gets scrambled.
+
+`duration`
+How many times to scramble before revealing next character.
+
+`infinite`
+Whether or not the scrambling effect is infinite.
+
+### Methods
+| Returns | Name |
+| ------- | ---- |
+| `void` | `start()` |
+| `void` | `set_text(text: String)` |
+| `String` | `get_text()` |
+
+#### start()
+start the scrambling. This acts as a setter function for `scrambling`
+
+#### set_text(text: String)
+Setter for the `text` of the parent class `Label`
+
+#### get_text() -> String
+Getter for the `text` of the parent class `Label`
+