doc: add stdin to guide (#6531)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->
Document in guide stdin usage

alllll the easter eggs can do as well, but declined to keep consistent
with the other examples 😆

Additions to https://github.com/astral-sh/uv/pull/6481

```bash
$ uv run - <<EOF               
import antigravity
EOF
```

## Test Plan

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https://github.com/astral-sh/uv/pull/6519#issuecomment-2307371063 new PR
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Billy Doyle 2024-08-23 12:18:49 -04:00 committed by GitHub
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@ -55,6 +55,14 @@ $ uv run example.py hello world!
hello world! hello world!
``` ```
Additionally, your script can be read directly from stdin:
```bash
uv run - <<EOF
print("hello world!")
EOF
```
Note that if you use `uv run` in a _project_, i.e. a directory with a `pyproject.toml`, it will Note that if you use `uv run` in a _project_, i.e. a directory with a `pyproject.toml`, it will
install the current project before running the script. If your script does not depend on the install the current project before running the script. If your script does not depend on the
project, use the `--no-project` flag to skip this: project, use the `--no-project` flag to skip this: