Fixed incorrect adapter doc

Author: GrahamCampbell

src/Repository/Adapter/ApacheAdapter.php

@@ -26,7 +26,7 @@ public function isSupported()
      *
      * @param string $name
      *
-     * @return \PhpOption\Option<string>
+     * @return \PhpOption\Option<string|null>
      */
     public function get($name)
     {

src/Repository/Adapter/ArrayAdapter.php

@@ -29,7 +29,7 @@ public function isSupported()
      *
      * @param string $name
      *
-     * @return \PhpOption\Option<string>
+     * @return \PhpOption\Option<string|null>
      */
     public function get($name)
     {

src/Repository/Adapter/EnvConstAdapter.php

@@ -22,7 +22,7 @@ public function isSupported()
      *
      * @param string $name
      *
-     * @return \PhpOption\Option<string>
+     * @return \PhpOption\Option<string|null>
      */
     public function get($name)
     {

src/Repository/Adapter/PutenvAdapter.php

@@ -21,10 +21,11 @@ public function isSupported()
      *
      * @param string $name
      *
-     * @return \PhpOption\Option<string>
+     * @return \PhpOption\Option<string|null>
      */
     public function get($name)
     {
+        /** @var \PhpOption\Option<string|null> */
         return Option::fromValue(getenv($name), false);
     }
 

src/Repository/Adapter/ReaderInterface.php

@@ -9,7 +9,7 @@ interface ReaderInterface extends AvailabilityInterface
      *
      * @param string $name
      *
-     * @return \PhpOption\Option<string>
+     * @return \PhpOption\Option<string|null>
      */
     public function get($name);
 }

src/Repository/Adapter/ServerConstAdapter.php

@@ -22,7 +22,7 @@ public function isSupported()
      *
      * @param string $name
      *
-     * @return \PhpOption\Option<string>
+     * @return \PhpOption\Option<string|null>
      */
     public function get($name)
     {