Fix build for RTD.

This resolves the build problems due to sphinx-doc/sphinx#9727 we've been seeing. RTD seems to by default run a <sphinx-2.0 which conflicts with newer docutils. Since we usually install sphinx from the system for building the docs instead pin docutils in the docs requirements file which is parsed by RTD.
zeek · Nov 4, 2021 · 82dd537 · 82dd537
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commit 82dd537
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diff --git a/doc/requirements.txt b/doc/requirements.txt
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+# Pin docutils as a workaround for https://github.com/sphinx-doc/sphinx/issues/9727.
+docutils = "<0.18"