Update visualization.rst

docs/extensions/visualization.rst

@@ -38,10 +38,8 @@ This module provides support and visualization of genotypic data stored in a mod
 Phylotree
 -------------------
 
-This extension provides a simple file formatter for [newick][1] tree files using
-the Javascript library ["phylotree"][2] for display.
-[1]: `Newick documentation <http://evolution.genetics.washington.edu/phylip/newicktree.html`__
-[2]: `Phylotree JS repository <https://github.com/veg/phylotree.js/tree/master`__
+This extension provides a simple file formatter for `Newick<http://evolution.genetics.washington.edu/phylip/newicktree.html`__ tree files using
+the Javascript library `Phylotree <https://github.com/veg/phylotree.js/tree/master`__ for display.
 
 `Documentation <https://cgit.drupalcode.org/phylotree/tree/README.md>`__
 `Repository <https://www.drupal.org/project/phylotree>`__