Fix typo in docs example code

[lzpap]

Description of change

Fix a typo in the example code for Transfers section.

Type of change

• Documentation Fix

Change checklist

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (docs/ directory and/or docstrings in source code)
• I have followed PEP-8 Style Guide in my code.
• New and existing unit tests pass locally with my changes