Minor PHPDocs fixes provided by PHPStan @ level 4.

Author: tomzx

src/PHPSemVerChecker/Operation/ClassMethodOperationDelta.php

@@ -108,7 +108,8 @@ public function getReason()
 	}
 
 	/**
-	 * @return string
+	 * @param mixed $context
+	 * @return int
 	 */
 	protected function getVisibility($context)
 	{

src/PHPSemVerChecker/Operation/ClassMethodOperationUnary.php

@@ -84,7 +84,8 @@ public function getReason()
 	}
 
 	/**
-	 * @return string
+	 * @param mixed $context
+	 * @return int
 	 */
 	protected function getVisibility($context)
 	{

src/PHPSemVerChecker/Operation/ClassRemoved.php

@@ -15,7 +15,7 @@ class ClassRemoved extends Operation {
 	 */
 	protected $reason = 'Class was removed.';
 	/**
-	 * @var
+	 * @var string
 	 */
 	protected $fileBefore;
 	/**

src/PHPSemVerChecker/Operation/InterfaceRemoved.php

@@ -15,7 +15,7 @@ class InterfaceRemoved extends Operation {
 	 */
 	protected $reason = 'Interface was removed.';
 	/**
-	 * @var
+	 * @var string
 	 */
 	protected $fileBefore;
 	/**

src/PHPSemVerChecker/Operation/TraitRemoved.php

@@ -15,7 +15,7 @@ class TraitRemoved extends Operation {
 	 */
 	protected $reason = 'Trait was removed.';
 	/**
-	 * @var
+	 * @var string
 	 */
 	protected $fileBefore;
 	/**