Clean up and correct Grafana Agent Static install on Linux

[clayton-cornell]

PR Description

The existing Grafana Agent Static install docs for Linux are not formatted correctly (markdown errors) and are not correct for openSUSE.

Issue: #3903

Which issue(s) this PR fixes

Notes to the Reviewer

PR Checklist

• CHANGELOG updated
• Documentation added
• Tests updated

[clayton-cornell]

Changes to the topic:

• Fixed markdown indenting for code blocks
• Fixed step numbering
• Removed reference to deprecated Linux command in Debian/Ubuntu section
• Added openSUSE/SUSE section
• Changed systemd restart to reload
• General alignment to Grafana Agent Flow wording/style

[clayton-cornell]

@marctc @zeitlinger Can one of you take a look over the changes I'm suggesting here. The main updates are around the new openSUSE. The other changes are generally markdown cleanup. I've tested the openSUSE section and it all seems to work correctly.

[zeitlinger]

I'm not an expert on the agent - what should I look at in particular?

[clayton-cornell]

In particular, I'd like some developer eyes on:

1. The openSUSE steps
2. The change from systemd restart to systemd reload
3. Removing the deprecated apt-key section

(everything else that was changed is cosmetic)

[zeitlinger]

In particular, I'd like some developer eyes on:

1. The openSUSE steps
2. The change from systemd restart to systemd reload`
3. Removing the deprecated apt-key section

(everything else that was changed is cosmetic)

I'm also not familiar with that - please reach out to the #agent team

[rfratto]

LGTM, thanks!

[Eve832]

lgtm!

[clayton-cornell]

Reviewed and ready to merge

[grafanabot]

The backport to release-v0.32 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-3931-to-release-v0.32 origin/release-v0.32
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 4b8807a517071556c7fd520d7ddd792fbcd311f7
# Push it to GitHub
git push --set-upstream origin backport-3931-to-release-v0.32
git switch main
# Remove the local backport branch
git branch -D backport-3931-to-release-v0.32

Then, create a pull request where the base branch is release-v0.32 and the compare/head branch is backport-3931-to-release-v0.32.

[grafanabot]

The backport to release-v0.33 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-3931-to-release-v0.33 origin/release-v0.33
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 4b8807a517071556c7fd520d7ddd792fbcd311f7
# Push it to GitHub
git push --set-upstream origin backport-3931-to-release-v0.33
git switch main
# Remove the local backport branch
git branch -D backport-3931-to-release-v0.33

Then, create a pull request where the base branch is release-v0.33 and the compare/head branch is backport-3931-to-release-v0.33.

[clayton-cornell]

Backported to v0.33. Removed backport to v0.32.