docs/otel-direct: refine python specific paragraph

[xrmx]

Simplify text, remove a `just", fix a typo.

[github-actions]

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[mergify]

This pull request does not have a backport label. Could you fix it @xrmx? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-/d./d is the label to automatically backport to the /d./d branch. /d is the digit
  NOTE: backport-skip has been added to this pull request.

[bmorelli25]

Thanks!