Remove the invalid comment 'Choose how data will be passed ...'

[seisman]

Description of proposed changes

The comment "Choose how data will be passed into the module" is invalid after we replace virtualfile_from_grid/matrix/vectors to virtualfile_from_data in #949, because we don't choose now (actually we still make choices but the logic is hidden in the virtualfile_from_data function).

Note: grdtrack.py is left intact because it will be addressed in PR #2708

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• If adding new functionality, add an example to docstrings or tutorials.
• Use underscores (not hyphens) in names of Python files and directories.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash commands are:

• /format: automatically format and lint the code
• /test-gmt-dev: run full tests on the latest GMT development version