Add fixer tidy for HTML

Add tests for tidy HTML fixer

doc/ale-html.txt

@@ -71,6 +71,14 @@ g:ale_html_tidy_options                               *g:ale_html_tidy_options*
   (mac), sjis (shiftjis), utf-16le, utf-16, utf-8
 
 
+g:ale_html_tidy_use_global                             *g:html_tidy_use_global*
+
+  Type: |Number|
+  Default: `get(g:, 'ale_use_global_executables', 0)`
+
+  See |ale-integrations-local-executables|
+
+
 ===============================================================================
 write-good                                                *ale-html-write-good*