Change docs to use --only main syntax

docs/cli.md

@@ -153,7 +153,7 @@ poetry install --without test,docs
 ```
 
 {{% note %}}
-The `--no-dev` option is now deprecated. You should use the `--without dev` notation instead.
+The `--no-dev` option is now deprecated. You should use the `--without dev` or `--only main` notation instead.
 {{% /note %}}
 
 You can also select optional dependency groups with the `--with` option.

docs/faq.md

@@ -214,7 +214,7 @@ For example, you might have a Dockerfile that looks something like this:
 FROM python
 COPY pyproject.toml poetry.lock .
 COPY src/ ./src
-RUN pip install poetry && poetry install --without dev
+RUN pip install poetry && poetry install --only main
 ```
 
 As soon as *any* source file changes, the cache for the `RUN` layer will be invalidated, which forces all 3rd party dependencies (likely the slowest step out of these) to be installed again if you changed any files in `src/`.
@@ -229,9 +229,9 @@ This might look something like this:
 ```text
 FROM python
 COPY pyproject.toml poetry.lock .
-RUN pip install poetry && poetry install --no-root --no-directory
+RUN pip install poetry && poetry install --only main --no-root --no-directory
 COPY src/ ./src
-RUN poetry install --without dev
+RUN poetry install --only main
 ```
 
 The two key options we are using here are `--no-root` (skips installing the project source) and `--no-directory` (skips installing any local directory path dependencies, you can omit this if you don't have any).