Add missing topic

Author: juliasilge

.github/workflows/R-CMD-check.yaml

@@ -33,8 +33,6 @@ jobs:
           - {os: ubuntu-18.04,   r: 'release'}
           - {os: ubuntu-18.04,   r: 'oldrel-1'}
           - {os: ubuntu-18.04,   r: 'oldrel-2'}
-          - {os: ubuntu-18.04,   r: 'oldrel-3'}
-          - {os: ubuntu-18.04,   r: 'oldrel-4'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}

_pkgdown.yml

@@ -70,6 +70,7 @@ reference:
       - tidy.model_fit
       - translate
       - starts_with("update")
+      - varying_args.model_spec
 
   - title: Developer Tools
     contents: