ci: fix else if -> elif typo in docs.yml (#2030)

.github/workflows/docs.yml

@@ -55,7 +55,7 @@ jobs:
           cd docs
           if [[ -n "${{ inputs.alias }}" ]]; then
             mike deploy --push ${{ inputs.version }} --update-aliases ${{ inputs.alias }}
-          else if [[ "${{ inputs.version }}" == "nightly" ]]; then
+          elif [[ "${{ inputs.version }}" == "nightly" ]]; then
             mike deploy --push ${{ inputs.version }}
           else
             mike deploy --push nightly