docs: fix @param and @return

Author: kenjis

system/Session/Session.php

@@ -197,7 +197,7 @@ public function __construct(SessionHandlerInterface $driver, App $config)
     /**
      * Initialize the session container and starts up the session.
      *
-     * @return mixed
+     * @return $this|void
      */
     public function start()
     {
@@ -450,8 +450,8 @@ public function destroy()
      * If $data is an array, it is expected to be an array of key/value pairs
      * to be set as session properties.
      *
-     * @param array|string $data  Property name or associative array of properties
-     * @param mixed        $value Property value if single key provided
+     * @param array|string                            $data  Property name or associative array of properties
+     * @param array|bool|float|int|object|string|null $value Property value if single key provided
      */
     public function set($data, $value = null)
     {
@@ -612,8 +612,8 @@ public function __isset(string $key): bool
      * Otherwise, it is interpreted as the identifier of a specific
      * flashdata property, with $value containing the property value.
      *
-     * @param array|string $data  Property identifier or associative array of properties
-     * @param array|string $value Property value if $data is a scalar
+     * @param array|string                            $data  Property identifier or associative array of properties
+     * @param array|bool|float|int|object|string|null $value Property value if $data is a scalar
      */
     public function setFlashdata($data, $value = null)
     {
@@ -695,7 +695,7 @@ public function markAsFlashdata($key): bool
     /**
      * Unmark data in the session as flashdata.
      *
-     * @param mixed $key Property identifier or array of them
+     * @param array|string $key Property identifier or array of them
      */
     public function unmarkFlashdata($key)
     {
@@ -744,9 +744,9 @@ public function getFlashKeys(): array
      * Sets new data into the session, and marks it as temporary data
      * with a set lifespan.
      *
-     * @param array|string $data  Session data key or associative array of items
-     * @param null         $value Value to store
-     * @param int          $ttl   Time-to-live in seconds
+     * @param array|string                            $data  Session data key or associative array of items
+     * @param array|bool|float|int|object|string|null $value Value to store
+     * @param int                                     $ttl   Time-to-live in seconds
      */
     public function setTempdata($data, $value = null, int $ttl = 300)
     {
@@ -760,7 +760,7 @@ public function setTempdata($data, $value = null, int $ttl = 300)
      *
      * @param string $key Session data key
      *
-     * @return mixed Session data value or null if not found.
+     * @return array|bool|float|int|object|string|null Session data value or null if not found.
      */
     public function getTempdata(?string $key = null)
     {