FIx formatting issues so that copy and paste works

[alecthegeek]

Modify example commands so that they can be copy/pasted into the terminal correctly

1. Remove spurious trailing whitespace in multiline command

2. Remove Shell prompt "$ " from example commands

Description

Fixes # (issue)

N/A

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• Housekeeping
• Documentation

How Has This Been Tested?

Tested visually

Checklist:

• [N/A ] My code follows the code style of this project.
• I have performed a self-review of my own code
• [N/A] I have commented my code, particularly in hard-to-understand areas
• [N/A] I have made corresponding changes to the documentation (header file)
• [N/A] I have updated the respective chapter in the Stellarium User Guide
• My changes generate no new warnings
• [N/A] I have added tests that prove my fix is effective or that my feature works
• [N/A] New and existing unit tests pass locally with my changes
• [N/A] Any dependent changes have been merged and published in downstream modules

[github-actions]

Thanks for adding your first pull request to Stellarium. If you have questions, please do not hesitate to contact us.

[alex-w]

Thanks!

[github-actions]

Hello @alecthegeek!

Please check the fresh version (development snapshot) of Stellarium:
https://github.com/Stellarium/stellarium-data/releases/tag/weekly-snapshot

[github-actions]

Hello @alecthegeek!

Please check the latest stable version of Stellarium:
https://github.com/Stellarium/stellarium/releases/latest