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Updating Troubleshooting Docs (#9329)

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* Add link to Discussions FAQ

* Remove old FAQ entries

I think these are no longer relevant.

- no-cache-dir: affected pip versions are *very* old now
- narrow unicode: not an issue from py3.3+
- utf-8 osx: upstream bug closed in 2019

Some of the other issues are also maybe not frequent.
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website/docs/usage/index.md
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@ -284,7 +284,9 @@ $ python -m pytest --pyargs %%SPACY_PKG_NAME --slow # basic and slow test
## Troubleshooting guide {#troubleshooting}
This section collects some of the most common errors you may come across when
installing, loading and using spaCy, as well as their solutions.
installing, loading and using spaCy, as well as their solutions. Also see the
[Discussions FAQ Thread](https://github.com/explosion/spaCy/discussions/8226),
which is updated more frequently and covers more transitory issues.
> #### Help us improve this guide
>
@ -311,62 +313,6 @@ language's `Language` class instead, for example
</Accordion>
<Accordion title="No such option: --no-cache-dir" id="no-cache-dir">
```
no such option: --no-cache-dir
```
The `download` command uses pip to install the pipeline packages and sets the
`--no-cache-dir` flag to prevent it from requiring too much memory.
[This setting](https://pip.pypa.io/en/stable/reference/pip_install/#caching)
requires pip v6.0 or newer. Run `pip install -U pip` to upgrade to the latest
version of pip. To see which version you have installed, run `pip --version`.
</Accordion>
<Accordion title="sre_constants.error: bad character range" id="narrow-unicode">
```
sre_constants.error: bad character range
```
In [v2.1](/usage/v2-1), spaCy changed its implementation of regular expressions
for tokenization to make it up to 2-3 times faster. But this also means that
it's very important now that you run spaCy with a wide unicode build of Python.
This means that the build has 1114111 unicode characters available, instead of
only 65535 in a narrow unicode build. You can check this by running the
following command:
```bash
$ python -c "import sys; print(sys.maxunicode)"
```
If you're running a narrow unicode build, reinstall Python and use a wide
unicode build instead. You can also rebuild Python and set the
`--enable-unicode=ucs4` flag.
</Accordion>
<Accordion title="Unknown locale: UTF-8" id="unknown-locale">
```
ValueError: unknown locale: UTF-8
```
This error can sometimes occur on OSX and is likely related to a still
unresolved [Python bug](https://bugs.python.org/issue18378). However, it's easy
to fix: just add the following to your `~/.bash_profile` or `~/.zshrc` and then
run `source ~/.bash_profile` or `source ~/.zshrc`. Make sure to add **both
lines** for `LC_ALL` and `LANG`.
```bash
$ export LC_ALL=en_US.UTF-8
$ export LANG=en_US.UTF-8
```
</Accordion>
<Accordion title="Import error: No module named spacy" id="import-error">
```