MDC-104 [6. Branded icon]: typo in text

[vadimsaroka]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://codelabs.developers.google.com/codelabs/mdc-104-java#5'
2. Observe the "Change the menu button icon" section
3. See a typo

Screenshots

Codelab details:

• Level MDC-104
• Language Java
• Link to the codelab at the step with the issue https://codelabs.developers.google.com/codelabs/mdc-104-java#5