Fix broken inline-code formatting in Data encoding lesson

[matti-sarjala]

URL to the relevant course

URL:
https://learning.quantum.ibm.com/course/quantum-machine-learning/data-encoding

Section / paragraph:
Learning course: “Data encoding”

Section:
“Introduction and notation”

Problem:
The paragraph says “like z_Feature Map and ZZ Feature Map)”. The inline-code formatting appears to be broken, and the feature-map names should likely be written as ZFeatureMapandZZFeatureMap`.

Select all that apply

• new content request
• typo
• code bug
• out-of-date content
• broken link
• other

Describe the fix or the content request.

In the Learning lesson Data encoding, there appears to be a small formatting/terminology typo in the Introduction and notation section.

The text currently says:

In practice, the built-in feature mappings in Qiskit (like `z_Feature Map and ZZ Feature Map) will typically include rotation layers and entangling layers...

The inline-code formatting appears to be broken: the backtick starts before z_Feature but does not close correctly.

I think this should likely be written as:

In practice, the built-in feature mappings in Qiskit, like ZFeatureMap and ZZFeatureMap, will typically include rotation layers and entangling layers...

Suggested minimal correction in learning/courses/quantum-machine-learning/data-encoding.ipynb:

- In practice, the built-in feature mappings in Qiskit (like `z_Feature Map and ZZ Feature Map) will typically include rotation layers and entangling layers that extend the state to many dimensions in the Hilbert space.
+ In practice, the built-in feature mappings in Qiskit, like `ZFeatureMap` and `ZZFeatureMap`, will typically include rotation layers and entangling layers that extend the state to many dimensions in the Hilbert space.

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