Fix typo in documentation (CodeEditApp#1090)

* Fix spelling mistake in documentation

* Fix missing link

* Update SegmentedControl.md

* Update FontPicker.md

Author: iggy890

Documentation.docc/CodeEditUI/SegmentedControl.md

@@ -6,7 +6,7 @@
 @State var selected: Int = 0
 var items: [String] = ["Tab 1", "Tab 2"]
 
-SegementedControl($selected, options: items)
+SegmentedControl($selected, options: items)
 ```
 
 ## Preview

Documentation.docc/Keybindings/KeybindingManager.md

@@ -23,7 +23,7 @@ Keybinding module exists as singleton, so you always can reference Keybindings u
 
 In order to fetch keybinding you need to call following function with string name ``KeybindingManager/named(with:)`` returning you ``KeyboardShortcutWrapper`` which contains ``KeyboardShortcutWrapper/keyboardShortcut`` which can be passed directly to  ``keyboardShortcut``. So the end code would look like `.keyboardShortcut(KeyboardShortcutWrapper.shared.named(with: "copy").keyboardShortcut`
 
-If shortcut wasnt found by name, it will return fallback shortcut which has following keybinding `Shift + ?`
+If shortcut wasn't found by name, it will return fallback shortcut which has following keybinding `Shift + ?`
 
 ### Adding new shortcut