Fix typos in comments and function names

[alexandear]

Summary

This PR fixes comments format, typos in comments and functions.

Change Details

Fixes the following doc issues:

• Package comment should start with package PACKAGE_NAME according to the doc.
• After // there should be a whitespace.
• Different typos in words.

Checklist

• [] Tests are passing: task test
• [] Code style is correct: task lint

[alexandear]

@geseq is the PR can be merged?

[geseq]

@hanzei