fix(calendar): Spelling

[lwcorp]

Description

The spelling needed correction.

Is it been tested?

• Development testing done

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have performed a peer-reviewed with team member(s)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[lwcorp]

Please note the failed tests failed Google's own original code, not my fix.

[lwcorp]

Merged with #456.