Merge pull request #405 from chirizxc/patch-1

Fix hyperlink

Author: Tishka17

docs/helper_tools/index.rst

@@ -6,7 +6,7 @@ State diagram
 
 You can generate image with your states and transitions.
 
-Firstly you need to install [graphviz](https://graphviz.org/download/) into your system.
+Firstly you need to install `graphviz <https://graphviz.org/download/>`_ into your system.
 Check installation instructions on official site.
 
 Install library with tools extras:
@@ -78,4 +78,4 @@ Just run ``aiogram-dialog-preview`` command passing path to ``Dispatcher``/``Rou
 
 .. literalinclude:: ./web_preview.sh
 
-See console output to get URL and error logs
+See console output to get URL and error logs