[tor-bugs] #24253 [Core Tor/Tor]: Update GettingStartedRust.md with new build instructions

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#24253: Update GettingStartedRust.md with new build instructions
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     Reporter:  chelseakomlo  |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Low           |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  rust
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 As we now build Rust modules in a single binary, the instructions for
 adding a new rust module has changed.

 See attached patch

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24253>
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