doc/reference: fix sidebar TOC depth

bluetech · bluetech · commit 4ecf313604af · 2023-10-29T21:55:17.000+02:00
Previously, the sidebar TOC had unlimited depth, making it useless and
interfering with the content. This seems to have regressed in pytest
7.2.x going by the RTD version selector.
diff --git a/doc/en/reference/reference.rst b/doc/en/reference/reference.rst
@@ -1,3 +1,5 @@
+:tocdepth: 3
+
 .. _`api-reference`:
 
 API Reference

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+:tocdepth: 3`
	`2`	`+`
`1`	`3`	.. _`api-reference`:
`2`	`4`
`3`	`5`	`API Reference`