fix the docs + examples of plot_bands

[FaranIdo]

Description

(1) The functions plot_rgb and _plot_image in plot.py had incorrect docstring for the parameter scale (default value is False).
(2) The example of "Turn On Scaling" in plot_bands_functionality.py didn't actually turn on scaling.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation update

How Has This Been Tested?

Executed plot_bands_functionality.py locally (inside virtualenv), verified that the pixels in the matplotlib output of Turn On Scaling in the range of 0..255

Checklist:

• I have already submitted an issue and it was approved for a pr by an earthpy maintainer
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[lwasser]

hi there @FaranIdo thank you for this pr!! we just updated our CI - if you can update this PR from main, i believe all tests should pass.

[FaranIdo]

@lwasser fixed :)

[lwasser]

@FaranIdo awesome!! thank you again for the PR fix!! we truly appreciate it! 🙏