docs: Fix typos and style

[jdbaldry]

• Use product name in title
• Clean up whitespace
• Simplify some language
• Fix 'Grafana' typo and avoid product possessive
• Use repetitive numbering

[JStickler]

{docs team] LGTM

[grafanabot]

This PR must be merged before a backport PR will be created.

[grafanabot]

This PR must be merged before a backport PR will be created.

[grafanabot]

The backport to release-2.9.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-13230-to-release-2.9.x origin/release-2.9.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x bbc50fdd5125348b0cae30b0b10aff952a19f29b

When the conflicts are resolved, stage and commit the changes:

git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-13230-to-release-2.9.x
# Create the PR body template
PR_BODY=$(gh pr view 13230 --json body --template 'Backport bbc50fdd5125348b0cae30b0b10aff952a19f29b from #13230{{ "\n\n---\n\n" }}{{ index . "body" }}')
# Create the PR on GitHub
echo "${PR_BODY}" | gh pr create --title 'chore: [release-2.9.x] docs: Fix typos and style' --body-file - --label 'size/L' --label 'type/docs' --label 'backport' --base release-2.9.x --milestone release-2.9.x --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-13230-to-release-2.9.x

# Create a pull request where the `base` branch is `release-2.9.x` and the `compare`/`head` branch is `backport-13230-to-release-2.9.x`.

# Remove the local backport branch
git switch main
git branch -D backport-13230-to-release-2.9.x