refactor: fix typo in neural_network.cpp

[eltociear]

Description of Change

fixed comment typo

Checklist

• [x] Added description of change
• [ ] Added file name matches File name guidelines
• [ ] Added tests and example, test must pass
• [ ] Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• [ ] Relevant documentation/comments is changed or added
• [ ] PR title follows semantic commit guidelines
• [ ] Search previous suggestions before making a new one, as yours may be a duplicate.
• [ ] I acknowledge that all my contributions will be made under the project's license.

Notes: intialize -> initialize

[github-actions[bot]]

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[eltociear]

Sorry, please check.