enable errors on doc build again

Author: jorisvandenbossche

.github/workflows/docbuild-and-upload.yml

@@ -57,8 +57,6 @@ jobs:
       run: python web/pandas_web.py web/pandas --target-path=web/build
 
     - name: Build documentation
-      # TEMP don't let errors fail the build until all string dtype changes are fixed
-      continue-on-error: true
       run: doc/make.py --warnings-are-errors
 
     - name: Build the interactive terminal