typo

.readthedocs.yml

@@ -12,7 +12,7 @@ build:
     post_install:
       # VIRTUAL_ENV needs to be set manually for now.
       # See https://github.com/readthedocs/readthedocs.org/pull/11152/
-      - VIRTUAL_ENV=$READTHEDOCS_VIRTUAL_ENV_PATH poetry install
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH poetry install
       - python3 -c "from hammer.tech import TechJSON; print(TechJSON.schema_json(indent=2))" > doc/Technology/schema.json
 
 # Build documentation with Sphinx