doc: Treat Sphinx warnings as errors
'make doc' will now fail if Sphinx outputs any warning messages during
documentation generation.

Change-Id: I3e466af58ccf29b14a7e61037539b79ab6fc6037
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
1 parent 8ff55a9 commit 8b815a4e03169e8b00c3345d31250513fb4cc953
@Sandrine Bailleux Sandrine Bailleux authored on 17 Apr 2020
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docs/Makefile