Update crawl_google_scholar_citation.py

[AlfianAliM]

Describe your change:

• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing. (Note: I added comments for clarity but did not include new doctests.)
• All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
  (Example URL: Web Scraping)
• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[AlfianAliM]

Hi @cclauss , I have made some updates in this pull request:

• Improved code readability by adding comments.

Could you please take a look and let me know your thoughts? Thank you!