Merge bitcoin/bitcoin#22317: doc: Highlight DNS requests part in tor.md

86a4a15bdcc96eb565ab80166642d71d542061a9 Highlight DNS request part (Prayank)

Pull request description:

  _What?_

  Highlight DNS requests part in Proxy section

  _Why?_

  1. DNS requests are very important while considering privacy
  2. Lot of users might skip reading it because of the way it is mixed with everything else in the doc right now
  3. I have seen lot of users ignoring DNS requests or unaware of such things while using privacy tools

  _How?_

  Initially I had tried keeping these lines separate from code block but [Jonatack didn't agree with the changes](https://github.com/bitcoin/bitcoin/pull/21157#discussion_r618177116). Harding suggested using [bold/italic in `<pre></pre>`](https://github.com/bitcoin/bitcoin/pull/21157#discussion_r644364143). I have used the suggestions from previous PR and added `---`

  This is a part of alternative described in https://github.com/bitcoin/bitcoin/pull/22316

ACKs for top commit:
  jonatack:
    ACK 86a4a15bdcc96eb565ab80166642d71d542061a9
  Rspigler:
    ACK 86a4a15bdcc96eb565ab80166642d71d542061a9
  achow101:
    ACK 86a4a15bdcc96eb565ab80166642d71d542061a9
  RiccardoMasutti:
    ACK 86a4a15
  lsilva01:
    ACK https://github.com/bitcoin/bitcoin/pull/22317/commits/86a4a15bdcc96eb565ab80166642d71d542061a9
  kristapsk:
    ACK 86a4a15bdcc96eb565ab80166642d71d542061a9
  theStack:
    ACK 86a4a15bdcc96eb565ab80166642d71d542061a9

Tree-SHA512: a4fe0e8c08df330e5ca78ce19ce74be7034c653f4374469d928908847a6debf385283e3a6da66de600566c7bab6290ccd35df26864aef94cbb3f294123391437

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