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Add example for compile current env packages (#1968) 

## Summary
I was going to create a feature-request issue for adding graph like
showing of currently installed dependencies in venv, but then I found
`uv pip freeze | uv pip compile` is what I'm looking for.

As one who manually pip-installs packages every once in a while (instead
of edit `requirements.in` each time), after a while I would need to have
graph of installed packages (e.g. to see how uninstallinga packages
effects on others).

I found this command is so useful and wondered if we could have this in
docs as one of `uv` features.
## Test Plan

<!-- How was it tested? -->

---------

Co-authored-by: Zanie Blue <contact@zanie.dev>
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@ -75,15 +75,17 @@ To install a package into the virtual environment:
uv pip install flask # Install Flask. uv pip install flask # Install Flask.
uv pip install -r requirements.txt # Install from a requirements.txt file. uv pip install -r requirements.txt # Install from a requirements.txt file.
uv pip install -e . # Install the current project in editable mode. uv pip install -e . # Install the current project in editable mode.
uv pip install "package @ ." # Install the current project from disk uv pip install "package @ ." # Install the current project from disk.
uv pip install "flask[dotenv]" # Install Flask with "dotenv" extra. uv pip install "flask[dotenv]" # Install Flask with "dotenv" extra.
``` ```
To generate a set of locked dependencies from an input file: To generate a set of locked dependencies:
```shell ```shell
uv pip compile pyproject.toml -o requirements.txt # Read a pyproject.toml file. uv pip compile pyproject.toml -o requirements.txt # Read a pyproject.toml file.
uv pip compile requirements.in -o requirements.txt # Read a requirements.in file. uv pip compile requirements.in -o requirements.txt # Read a requirements.in file.
echo flask | uv pip compile - -o requirements.txt # Read from stdin.
uv pip freeze | uv pip compile - -o requirements.txt # Lock the current environment.
``` ```
To sync a set of locked dependencies with the virtual environment: To sync a set of locked dependencies with the virtual environment: