Fixed syntax error in tag::minify().

Updated some incorrect types in phpDoc tags.

Author: hexydec

src/htmldoc.php

@@ -127,7 +127,7 @@ public function offsetGet(mixed $i) : mixed { // return reference so you can set
 	/**
 	 * Retrieve the document node in the current position
 	 *
-	 * @return tag|text|comment|doctype The child node at the current pointer position
+	 * @return tag|text|comment|doctype|null The child node at the current pointer position or null if there are no children
 	 */
 	public function current() : mixed {
 		return $this->children[$this->pointer] ?? null;

src/tokens/tag.php

@@ -4,7 +4,7 @@
 use \hexydec\tokens\tokenise;
 
 /**
- * @property \hexydec\html\tag $parent
+ * @property tag|null $parent
  * @property htmldoc $root
  * @property array $config
  * @property tag|null $parent
@@ -744,7 +744,7 @@ public function find(array $selector, bool $searchChildren = true) : array {
 
 					// match first-child
 					case 'first-child':
-						$children =  !== null ? $this->parent->children() : [];
+						$children = $this->parent !== null ? $this->parent->children() : [];
 						if (!isset($children[0]) || $this !== $children[0]) {
 							$match = false;
 							break 2;