Basic cleanup.

README.md

@@ -124,7 +124,6 @@ This should produce something similar to:
 <?php
 use ParagonIE\Halite\HiddenString;
 use ParagonIE\Halite\KeyFactory;
-use ParagonIE\Halite\Symmetric\Crypto as Symmetric;
 
 $passwd = new HiddenString('correct horse battery staple');
 // Use random_bytes(16); to generate the salt:

src/Symmetric/Crypto.php

@@ -99,7 +99,7 @@ public static function decrypt(
            authentication. By using separate keys, we can reasonably dismiss
            likely cross-protocol attacks.
 
-           This uses salted HKDF to split the keys, whic is why we need the
+           This uses salted HKDF to split the keys, which is why we need the
            salt in the first place. */
         list($encKey, $authKey) = self::splitKeys($secretKey, $salt, $config);
 
@@ -162,7 +162,7 @@ public static function encrypt(
            authentication. By using separate keys, we can reasonably dismiss
            likely cross-protocol attacks.
 
-           This uses salted HKDF to split the keys, whic is why we need the
+           This uses salted HKDF to split the keys, which is why we need the
            salt in the first place. */
         list($encKey, $authKey) = self::splitKeys($secretKey, $salt, $config);
 

stub/Sodium.stub.php

@@ -380,7 +380,7 @@ function crypto_generichash_update(
         string &$hashState,
         string $append
     ): bool {
-        return '';
+        return false;
     }
 
     /**
@@ -392,7 +392,7 @@ function crypto_generichash_update(
      * @return string
      */
     function crypto_generichash_final(
-        string $state,
+        string $hashState,
         int $length = 32
     ): string {
         return '';