ogma-cli: Fix grammatical errors in ROS 2 tutorial. Refs #341.

[ivanperez-keera]

Fix existing grammatical errors in ROS 2 tutorial, as prescribed in the solution proposed for #341.

[ivanperez-keera]

Change Manager: Verified that:

• Solution is implemented:
  • The code proposed compiles and passes all tests. Details:
    • Build logs:
      • https://github.com/nasa/ogma/actions/runs/21674435438/job/62490663623
      • https://github.com/nasa/ogma/actions/runs/21674435437/job/62490663652
      • https://github.com/nasa/ogma/actions/runs/21674435439/job/62490663630
      • https://github.com/nasa/ogma/actions/runs/21674435441/job/62490663541
    • Build log archives:
      • logs_56386964980.zip
      • [logs_56386964982.zip](https://github.com/user-attachments/files/25092992/logs_56386964982.zip
      • logs_56386964987.zip
      • logs_56386964988.zip
  • The solution proposed produces the expected result. Details:
    Evaluated by visual inspection and using a standard grammar checker. No further grammatical errors have been found in the tutorial.
• Implementation is documented. Details:
  Change is to the documentation in an example.
• Change history is clear.
• Commit messages are clear.
• Changelogs are updated.
• Examples are updated. Details:
  Change is to the examples.
• Author is internal or has provided signed CLA.
• Required version bumps are evaluated. Details:
  Bump not needed; change is to the documentation.