Remove outdated code of conduct and contribution docs

Add missing @throws tags
Remove unused variables in list

Author: nickdnk

CODE_OF_CONDUCT.md

@@ -92,6 +92,7 @@ public function __serialize(): array
 
     /**
      * Unserializes a string as a FacebookApp entity.
+     * @throws FacebookSDKException
      */
     public function unserialize(string $serialized): void
     {

CONTRIBUTING.md

@@ -24,8 +24,6 @@
 
 namespace Facebook\GraphNodes;
 
-use Facebook\FileUpload\FacebookVideo;
-
 /**
  * Class GraphPage
  *

src/Facebook/FacebookApp.php

@@ -56,9 +56,10 @@ abstract class FacebookSignedRequestFromInputHelper
     /**
      * Initialize the helper and process available signed request data.
      *
-     * @param FacebookApp    $app          The FacebookApp entity.
-     * @param FacebookClient $client       The client to make HTTP requests.
-     * @param string|null    $graphVersion The version of Graph to use.
+     * @param FacebookApp $app The FacebookApp entity.
+     * @param FacebookClient $client The client to make HTTP requests.
+     * @param string|null $graphVersion The version of Graph to use.
+     * @throws FacebookSDKException
      */
     public function __construct(FacebookApp $app, FacebookClient $client, ?string $graphVersion = null)
     {
@@ -71,6 +72,7 @@ public function __construct(FacebookApp $app, FacebookClient $client, ?string $g
 
     /**
      * Instantiates a new SignedRequest entity.
+     * @throws FacebookSDKException
      */
     public function instantiateSignedRequest(?string $rawSignedRequest = null): void
     {

src/Facebook/GraphNodes/GraphPage.php

@@ -98,7 +98,7 @@ public function getHttpResponseCode(): ?int
     public function setHttpResponseCodeFromHeader(string $rawResponseHeader): void
     {
         // https://tools.ietf.org/html/rfc7230#section-3.1.2
-        list($version, $status, $reason) = array_pad(explode(' ', $rawResponseHeader, 3), 3, null);
+        list(,$status) = array_pad(explode(' ', $rawResponseHeader, 3), 3, null);
         $this->httpResponseCode = (int)$status;
     }
 

src/Facebook/Helpers/FacebookSignedRequestFromInputHelper.php

@@ -54,6 +54,7 @@ class SignedRequest
      *
      * @param FacebookApp $facebookApp The FacebookApp entity.
      * @param string|null $rawSignedRequest The raw signed request.
+     * @throws FacebookSDKException
      */
     public function __construct(FacebookApp $facebookApp, ?string $rawSignedRequest = null)
     {
@@ -115,6 +116,7 @@ public function hasOAuthData(): bool
 
     /**
      * Creates a signed request from an array of data.
+     * @throws FacebookSDKException
      */
     public function make(array $payload): string
     {
@@ -131,6 +133,7 @@ public function make(array $payload): string
     /**
      * Validates and decodes a signed request and saves
      * the payload to an array.
+     * @throws FacebookSDKException
      */
     protected function parse(): void
     {