MNT: Don't build docs in parallel

StefRe · StefRe · commit 668f19050021 · 2022-09-30T11:10:14.000+02:00
Parallel build fails with Sphinx parallel build error:
ValueError: gallery/pyplots/dollar_ticks is already noted as
redirecting to gallery/ticks/dollar_ticks
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -141,7 +141,7 @@ commands:
                [ "$CIRCLE_PR_NUMBER" = "" ]; then
               export RELEASE_TAG='-t release'
             fi
-            make html O="-T $RELEASE_TAG -j4 -w /tmp/sphinxerrorswarnings.log"
+            make html O="-T $RELEASE_TAG -w /tmp/sphinxerrorswarnings.log"
             rm -r build/html/_sources
           working_directory: doc
       - save_cache:
