bpo-42238: Doc CI: Disable suspicious checks. (GH-26575)

They are slow and raise too many false positive, I'm in the slow
process to try to change this.

.github/workflows/doc.yml

@@ -38,7 +38,7 @@ jobs:
     - name: 'Install build dependencies'
       run: make -C Doc/ PYTHON=../python venv
     - name: 'Build documentation'
-      run: xvfb-run make -C Doc/ PYTHON=../python SPHINXOPTS="-q -W --keep-going -j4" doctest html suspicious
+      run: xvfb-run make -C Doc/ PYTHON=../python SPHINXOPTS="-q -W --keep-going -j4" doctest html
     - name: 'Upload'
       uses: actions/upload-artifact@v2.2.3
       with:

.travis.yml

@@ -53,7 +53,7 @@ matrix:
         - cd Doc
         - make venv PYTHON=python
       script:
-        - make check html suspicious SPHINXOPTS="-q -W -j4"
+        - make check html SPHINXOPTS="-q -W -j4"
     - name: "Documentation tests"
       os: linux
       language: c