revert docs change

Signed-off-by: Nitish Bharambe <nitish.bharambe@alliander.com>

.readthedocs.yaml

@@ -15,7 +15,7 @@ build:
   jobs:
     post_install:
       # Build package with doc requirements from pyproject.optional-dependencies
-      - pip install --verbose --editable .[docs]
+      - pip install --verbose --editable .[doc]
       # remove API DLL define in header
       - find power_grid_model_c/power_grid_model_c/include -name *.h -exec sed -i -r "s/#define PGM.*//g" {} \;
       - find power_grid_model_c/power_grid_model_c/include -name *.h -exec sed -i -r "s/PGM_API //g" {} \;

docs/advanced_documentation/build-guide.md

@@ -469,10 +469,10 @@ built and installed, e.g. using `cmake --build --preset <preset> --target instal
 
 ## Documentation
 
-The documentation is built in [Sphinx](https://github.com/sphinx-doc/sphinx). It can be built locally in a Python environment. The packages required for building it can be found under the `[docs]` optional dependencies. In addition, the `power-grid-model` Python package needs to be built by following the steps mentioned [above](#build-python-package). After that, the documentation specific packages can be installed via:
+The documentation is built in [Sphinx](https://github.com/sphinx-doc/sphinx). It can be built locally in a Python environment. The packages required for building it can be found under the `[doc]` optional dependencies. In addition, the `power-grid-model` Python package needs to be built by following the steps mentioned [above](#build-python-package). After that, the documentation specific packages can be installed via:
 
 ```shell
-pip install -e .[docs]
+pip install -e .[doc]
 ```
 
 ```{note}

pyproject.toml

@@ -40,7 +40,7 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 dev = ["msgpack", "pre-commit", "pylint", "pytest", "pytest-cov"]
-docs = [
+doc = [
     "sphinx",
     "breathe",
     "myst_nb",