Fix issues found by phan

Author: mmoll

MO4/Sniffs/Arrays/ArrayDoubleArrowAlignmentSniff.php

@@ -39,7 +39,7 @@ class ArrayDoubleArrowAlignmentSniff implements Sniff
     /**
      * Registers the tokens that this sniff wants to listen for.
      *
-     * @return array(int)
+     * @return array<int, int>
      * @see    Tokens.php
      */
     public function register()

MO4/Sniffs/Arrays/MultiLineArraySniff.php

@@ -36,7 +36,7 @@ class MultiLineArraySniff implements Sniff
     /**
      * Registers the tokens that this sniff wants to listen for.
      *
-     * @return array(int)
+     * @return array<int, int>
      * @see    Tokens.php
      */
     public function register()

MO4/Sniffs/Commenting/PropertyCommentSniff.php

@@ -16,7 +16,7 @@
 /**
  * Property Comment Sniff sniff.
  *
- * Doc blocks of class properties must be multiline and have exactly one '@var'
+ * Doc blocks of class properties must be multiline and have exactly one var
  * annotation.
  *
  * @author    Xaver Loppenstedt <[email protected]>

MO4/Sniffs/Formatting/UnnecessaryNamespaceUsageSniff.php

@@ -43,7 +43,7 @@ class UnnecessaryNamespaceUsageSniff implements Sniff
     /**
      * Registers the tokens that this sniff wants to listen for.
      *
-     * @return array(int)
+     * @return array<int, int>
      * @see    Tokens.php
      */
     public function register()

MO4/Sniffs/Strings/VariableInDoubleQuotedStringSniff.php

@@ -36,7 +36,7 @@ class VariableInDoubleQuotedStringSniff implements Sniff
     /**
      * Registers the tokens that this sniff wants to listen for.
      *
-     * @return array(int)
+     * @return array<int, string>
      *
      * @see Tokens.php
      */