Quickstart sets r.encoding after r.text, which raises ValueError

[HighnessAtharva]

Following the quickstart in order in one Python session, the "Text Encoding" section reads r.text and then shows:

>>> r.encoding = 'ISO-8859-1'

On the current release this raises:

ValueError: Setting encoding after `text` has been accessed is not allowed.

The setter's docstring documents that rule, but the quickstart does not, so a reader who runs the snippets in order hits it. A one-line change would fix it: "If you need to override the standard behaviour, set the encoding before you access r.text." I can open a PR with that wording if it helps.

Found by running the quickstart in a clean python:3.11-slim container with FirstRun.