update doc links

Author: Borda

.azure/ipynb-publish.yml

@@ -101,6 +101,7 @@ jobs:
       displayName: 'Generate notebook'
 
     - bash: |
+        set -e
         mkdir $(PATH_DATASETS)
         # render the actual notebooks
         while IFS= read -r line; do

.azure/ipynb-tests.yml

@@ -77,6 +77,7 @@ jobs:
       displayName: 'Generate notebook'
 
     - bash: |
+        set -e
         while IFS= read -r line; do
             python .actions/assistant.py bash-test $line > .actions/_ipynb-test.sh
             cat .actions/_ipynb-test.sh

lightning_examples/mnist-hello-world/.meta.yml

@@ -3,7 +3,7 @@ author: PL team
 created: 2020-12-21
 updated: 2021-06-16
 license: CC BY-SA
-build: 3
+build: 4
 tags:
   - Image
 description: In this notebook, we'll go over the basics of lightning by preparing