Explicitly set a language (#739)

All documentation is in English, and Sphinx 5 complains loudly if this isn't set.
aio-libs · Jun 14, 2022 · 1a60f70 · 1a60f70
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diff --git a/CHANGES/739.misc.rst b/CHANGES/739.misc.rst
@@ -0,0 +1 @@
+Changed the Sphinx ``language`` parameter to ``"en"`` to allow for Sphinx 5.0.
diff --git a/docs/conf.py b/docs/conf.py
@@ -107,7 +107,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used: