Fix warnings from sphinx

- fix path in readthedocs configuration

Author: mrbean-bremen

.readthedocs.yaml

@@ -9,5 +9,5 @@ build:
     python: "3.11"
 
 sphinx:
-  configuration: docs/conf.py
+  configuration: docs/source/conf.py
   fail_on_warning: true

docs/source/usage.rst

@@ -399,12 +399,12 @@ supported.
 
 
 Multiple test order markers
--------------------
+---------------------------
 More than one order marker can be set for the test.
 In this scenario test will be executed several times in the defined order.
 
 Combination of absolute and relative ordering
-~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 .. code:: python
 
  import pytest
@@ -449,7 +449,7 @@ so it will be run multiple times.
 
 
 Parametrized tests
-~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~
 Although multiple test order markers create their own parametrization, it can be used with parametrized tests.
 
 .. code:: python