Fix typo in quantization.md note

[JonyD]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (fix typo in docs)

Changelog

What are the changes made in this PR?
*Fix typo in quantization.md note

UX

If your function changed a public API, please add a dummy example of what the user experience will look like when calling it.
Here is a docstring example
and a tutorial example

• I did not change any public API
• I have added an example to docs or docstrings

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