Fix typo in ReadTheDocs config

Author: jodal

.readthedocs.yml

@@ -8,7 +8,7 @@ build:
     post_create_environment:
       - pip install uv
     post_install:
-      - UV_PROJECT_ENVIRONMENT=$READTHEDOCS_VIRTUALENV_PATH uv sync --all-extras --group docs --link-mode copys
+      - UV_PROJECT_ENVIRONMENT=$READTHEDOCS_VIRTUALENV_PATH uv sync --all-extras --group docs --link-mode copy
 
 sphinx:
   configuration: docs/conf.py