Merge pull request #924 from lukaszstolarczuk/fix-docs-gen

docker: fix auto docs generating - force clean dir

Author: igchor

utils/docker/run-doc-update.sh

@@ -58,7 +58,7 @@ git checkout -B ${GH_PAGES_NAME} upstream/gh-pages
 git clean -dfx
 
 # Clean old content, since some files might have been deleted
-rm -r ./${VERSION}
+rm -rf ./${VERSION}
 mkdir -p ./${VERSION}/doxygen/
 
 cp -fr ${ARTIFACTS_DIR}/cpp_html/* ./${VERSION}/doxygen/