Fix broken i.pca command in remote sensing tutorials

[Valyrian-Code]

Fixes #104

This PR fixes two issues in the PCA section of both the English and Portuguese remote sensing tutorials:

1. Trailing space in input list – landsat8_2024_B4, landsat8_2024_B5 (note the space after the comma) causes i.pca to fail in both the CLI and Python examples.
2. Missing quotes around the output parameter – output=Flagstaff_landsat8 in the Python example references an undefined variable instead of the string "Flagstaff_landsat8", resulting in a NameError.

The fixes have been applied to:

• GRASS_remotesensing.qmd
• GRASS_remotesensing_pt.qmd

These changes ensure that all PCA examples run successfully as written.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Fixes the PCA tutorial snippets to use consistent band lists (no stray spaces) and correct GRASS Python API usage.

Changes:

• Normalized i.pca input=... lists to remove an extra space after a comma in both PT and EN tutorials.
• Fixed gs.run_command(..., output=...) to pass the output map name as a string literal (and cleaned formatting).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
content/tutorials/remote_sensing_visualization/GRASS_remotesensing_pt.qmd	Aligns PCA bash/Python examples; fixes Python output argument quoting and input list formatting.
content/tutorials/remote_sensing_visualization/GRASS_remotesensing.qmd	Same corrections as PT version for consistency and correctness in English tutorial.

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