change example so it works as is on powershell and cmd

[jimkutter]

Summary

When going through the docs at https://docs.astral.sh/uv/guides/install-python/#automatic-python-downloads, when you try to copy and paste the example on Windows, in either PowerShell or cmd.exe the example won't work.

Inverting the quotes fixes it, and still works on other shells (I only tried bash under wsl)

Test Plan

On any windows system, from powershell, running the example yields the following error:

> uv run --python 3.12 python -c 'print("hello world")'
  File "<string>", line 1
    print(hello world)
          ^^^^^^^^^^^
SyntaxError: invalid syntax. Perhaps you forgot a comma?

on cmd.exe

> uv run --python 3.12 python -c 'print("hello world")'

(there is no output)

Inverting the quotes on powershell

> uv run --python 3.12 python -c "print('hello world')"
hello world

on cmd.exe

> uv run --python 3.12 python -c "print('hello world')"
hello world

[zanieb]

Thanks!

[zanieb]

Welcome to the project :)