docs: Use consistent description for the 'outgrid' parameter

[seisman]

Description of proposed changes

Preview: https://pygmt-dev--2874.org.readthedocs.build/en/2874/api/generated/pygmt.grdclip.html#pygmt.grdclip

Fixes #2695

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

[yvonnefroehlich]

This is not directly related to this PR, but I am wondering why there is sometimes a blank line between the docstrings of two parameters and sometimes not (the example is from grdclip):

pygmt/pygmt/src/grdclip.py

Lines 51 to 56 in ec22b0c

	Parameters
	----------
	{grid}
	{outgrid}
	{region}
	above : str or list

Results in: