chore(docs): update kafka docs and related ones

[paologallinaharbur]

This PR:

• fixes the link for the latest kafka installer pointing to the exe one
• clarify the jmx page
• removed in different places the requirement to restart the agent

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[paologallinaharbur]

For docs folks: no idea if it is better to show the url when downloading something or not 😄
I followed the same approach we had for kafka, but the old one might be better

[homelessbirds]

@paologallinaharbur Would you mind signing our CLA one more time? Thanks!

[paologallinaharbur]

@homelessbirds done!

[homelessbirds]

@bradleycamacho can you take a look at this one? Looks like it touches a lot of your work.

[paologallinaharbur]

Any news?

[bradleycamacho]

Hi @paologallinaharbur! Sorry, I didn't notice Sammie's notification earlier. Merging this in now.