Fix generateBlockHeader docBlocks

At the subRenderer classes and their interface, the return value of the
method is described as "Start of the diff view" but should describe
start of block.

Author: DigiLive

lib/jblond/Diff/Renderer/Html/Inline.php

@@ -233,7 +233,7 @@ public function generateLinesReplace(array $changes): string
      *
      * @param array $changes Contains the op-codes about the changes between two blocks of text.
      *
-     * @return string Start of the diff view.
+     * @return string Start of the block.
      */
     public function generateBlockHeader(array $changes): string
     {

lib/jblond/Diff/Renderer/Html/SideBySide.php

@@ -269,7 +269,7 @@ public function generateLinesReplace(array $changes): string
      *
      * @param   array  $changes  Contains the op-codes about the changes between two blocks of text.
      *
-     * @return string Start of the diff view.
+     * @return string Start of the block.
      */
     public function generateBlockHeader(array $changes): string
     {

lib/jblond/Diff/Renderer/Html/Unified.php

@@ -170,7 +170,7 @@ public function generateLinesReplace(array $change): string
      *
      * @param array $changes Contains the op-codes about the changes between two blocks of text.
      *
-     * @return string Start of the diff view.
+     * @return string Start of the block.
      */
     public function generateBlockHeader(array $changes): string
     {

lib/jblond/Diff/Renderer/SubRendererInterface.php

@@ -37,7 +37,7 @@ public function generateDiffHeader(): string;
      *
      * @param array $changes Contains the op-codes about the changes between two blocks of text.
      *
-     * @return string Start of the diff view.
+     * @return string Start of the block.
      */
     public function generateBlockHeader(array $changes): string;