Add common alias "verbose" (V) to grdlandmask and savefig

[sean0921]

Description of proposed changes

Add common alias "verbose" (V) to grdlandmask and savefig before #1281 is solved.

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 adding new functionality, add an example to docstrings or tutorials.

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

[weiji14]

Hi @sean0921! Thanks for your PR, I was just reading your blog post https://sean0921.github.io/2021/06/21/pygmt-2021-6-feedback/ just now and really appreciate the honest feedback. A few of us seismologists (cc @core-man) are keen on implementing sac (see #967 (comment)) and will look into it in the coming months. You're welcome to help out if you have time, or open up specific feature request issues for modules like sac and project at https://github.com/GenericMappingTools/pygmt/issues/new/choose.

Anyways, back to this PR. Please add a line with {V} to the docstring so that the verbose documentation will show up. It should look similar to this

pygmt/pygmt/src/grdimage.py

Lines 154 to 156 in b2808cf

	{R}
	{V}
	{XY}

[core-man]

@sean0921 Thanks for your PR. Your blog post is great. Welcome to contribute to PyGMT and I believe you could make great help for the project.

[sean0921]

also add {V} docstring to savefig (a wrapper of psconvert?)
also let savefig API documentation show aliases
It seems not work and there's already a tip for readers to look at psconvert page in savefig page

[weiji14]

also add {V} docstring to savefig (a wrapper of psconvert?)
also let savefig API documentation show aliases
It seems not work and there's already a tip for readers to look at psconvert page in savefig page

I think it works, the documentation build at https://pygmt-eowmibjw9-gmt.vercel.app/api/generated/pygmt.Figure.psconvert.html shows the 'verbose' parameter documentation.

[michaelgrund]

Looks good to me!

[welcome]

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