Update doc/en/warnings.rst

graingert · nicoddemus · web-flow · commit 692def25f98b · 2020-08-04T19:53:43.000+01:00
Co-authored-by: Bruno Oliveira &lt;nicoddemus@gmail.com&gt;
diff --git a/doc/en/warnings.rst b/doc/en/warnings.rst
@@ -84,6 +84,7 @@ all other warnings into errors.
 .. code-block:: toml
 
     [tool.pytest.ini_options]
+    # note the use of single quote below to denote "raw" strings in TOML
     filterwarnings = [
         "error",
         "ignore::UserWarning",
