WIP: Clean up docs in new and refactored content

[clayton-cornell]

PR Description

This PR is for a general tidy of some topics. Focus is on:

• Clean up table spacing - for readability in source
• Remove empty spaces at the end of lines
• Tidy up minor language use (don't vs do not, configuration vs config, and so on)
• Replace the agent with the product name variable
• Fix some bad canonical link definitions (broken when topics were moved in other PRs)
• Fix some note formatting
• Remove exclamation punctuation

Which issue(s) this PR fixes

Notes to the Reviewer

PR Checklist

• CHANGELOG.md updated
• Documentation added
• Tests updated
• Config converters updated

[grafanabot]

The backport to release-v0.39 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-6219-to-release-v0.39 origin/release-v0.39
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 2c4f3e1c793f211e08ac0796becbbb48e726ef56
# Push it to GitHub
git push --set-upstream origin backport-6219-to-release-v0.39
git switch main
# Remove the local backport branch
git branch -D backport-6219-to-release-v0.39

Then, create a pull request where the base branch is release-v0.39 and the compare/head branch is backport-6219-to-release-v0.39.

[clayton-cornell]

Cancelled backport to 0.39. Edits included new content that isn't in 0.39. Changes are cleanup, so no new content. This can be published with 0.40.