DOC: Fix typos "Scientific" to "scientific"

[yvonnefroehlich]

Description of proposed changes

Just minor typo fixes following https://github.com/GenericMappingTools/pygmt/pull/3447#discussion_r1770939799.

Fixes #

Preview:

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 command is:

• /format: automatically format and lint the code

[seisman]

@yvonnefroehlich Please also fix the following files:

README.md
194:rest of the Scientific Python ecosystem, and therefore:

doc/maintenance.md
127:rest of the Scientific Python ecosystem, and therefore:

[yvonnefroehlich]

@yvonnefroehlich Please also fix the following files:

README.md
194:rest of the Scientific Python ecosystem, and therefore:

doc/maintenance.md
127:rest of the Scientific Python ecosystem, and therefore:

Done in the commits https://github.com/GenericMappingTools/pygmt/pull/3555/commits/ded80edb4f8505d39731e52b56775bcc618346ce and https://github.com/GenericMappingTools/pygmt/pull/3555/commits/19653a08037e19dd4d145db62938f44f12550fcf.