error in documentation

[progdog-ru]

I didn't find where to report a bug in your documentation. So excuse me for writing here.
Error on page: https://amp.dev/documentation/components/amp-inputmask/?format=websites#mask-output

Correct this text:
When mask-output is set to raw, the form will submit the input value as-is, and the form will add a hidden input. The hidden input will have the alphanumeric characters from the original input. Its name will be the original input's name with -unmasked appended. For example, if the input contains +1 (800) 123-4567, the form will submit the following values: - please, change raw to alphanumeric

I lost 1 hour of time because of this error.
Correct, or write - where to report this error.