Correct wording

[bnm3k]

Some minor changes if you dont mind :)

• free from writing -> free form writing
• so the Grafana -> so has Grafana

[bwplotka]

We don't, but we just pushed the latest version after public review: https://github.com/cncf/tag-observability/pull/132

Can you rebase and update your PR? Perhaps those are fixed already? 🤗

[bnm3k]

Hmm, I think my PR is no longer needed, the latest changes have already fixed some of the wording or done away with the sentences