lld docs config: Use a list key in html_sidebars
Otherwise the docs-lld-html target fails to build using recent Sphinx
with the following not very helpful error message:
An error happened in rendering the page index.
Reason: TemplateNotFound()
It turns out the values in the html_sidebars dictionary always need to be lists
now. See https://github.com/sphinx-doc/sphinx/issues/6186
diff --git a/lld/docs/conf.py b/lld/docs/conf.py
index 7d4fc0c..ee93c01 100644
--- a/lld/docs/conf.py
+++ b/lld/docs/conf.py
@@ -134,7 +134,7 @@
#html_use_smartypants = True
# Custom sidebar templates, maps document names to template names.
-html_sidebars = {'index': 'indexsidebar.html'}
+html_sidebars = {'index': ['indexsidebar.html']}
# Additional templates that should be rendered to pages, maps page names to
# template names.
