Fix "pandas.Dataframe" to "pandas.DataFrame" in pygmt/datasets/samples.py

[MichaeINeumann]

Description of proposed changes

Replace (Match case and WholeWord) "pandas.Dataframe" to "pandas.DataFrame"

Fixes #1123

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[seisman]

@MichaeINeumann Thanks for your quick fix!

Just a few tiny suggestions to remove the extra whitespace before pandas.DataFrame.

[MichaeINeumann]

@seisman "Just a few tiny suggestions to remove the extra whitespace before pandas.DataFrame."
Sorry, you did this changes allready? It's my first time at gitHub. Do you expected enything else from me?
THX

[seisman]

"Just a few tiny suggestions to remove the extra whitespace before pandas.DataFrame."
Sorry, you did this changes? It's my first time at gitHub. Do you expected enything else from me? THX

Sorry, I shouldn't assume any git or github knowledge for new contributors.

As you can see, I just made three suggestions for this PR, but they're NOT committed to this PR yet:

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[seisman]

Great! Just one more tip, when you make some changes and submit a PR, please choose "Create a new branch for this commit and start a pull request" and click on the "Propose changes" button to open a pull request.

It's much better than choosing "commit directly to the master branch".

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