docs: convert headings to title case in r.example.md

[ArthPatel1502]

This PR updates the headings in doc/examples/python/script/r.example.md
from ALL CAPS to Title Case as suggested in issue #5239.

This is my first contribution to GRASS GIS.

[ArthPatel1502]

This is my first contribution to GRASS GIS.
Please let me know if anything needs to be adjusted. 🙂

[ArthPatel1502]

“I noticed the ‘Code scanning cannot determine the alerts introduced by this pull request’ warning. Since this PR only touches documentation and not Python code, I assume this is related to the repository’s code scanning configuration and not to this change, but please let me know if I should adjust anything.”

[echoix]

“I noticed the ‘Code scanning cannot determine the alerts introduced by this pull request’ warning. Since this PR only touches documentation and not Python code, I assume this is related to the repository’s code scanning configuration and not to this change, but please let me know if I should adjust anything.”

Doesn't matter for this kind of PR. And the PR doesn't risk to be too much outdated when one or more unrelated commits are merged to main. It doesn't need to be updated from main after each commit (if done for each PR, it would exponentially increase the time waiting for CI!). We only have the option enabled for us to update PRs without waiting for authors when too old or changes that might impact a PR or merged (even if not a conflict as per say)

[ArthPatel1502]

Thank you for the clarification! That makes sense, and I’ll keep it in mind for future PRs. 🙂

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