[tor-bugs] #18057 [Tor]: Be more explicit about the certificate format in `tor-spec.txt`

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#18057: Be more explicit about the certificate format in `tor-spec.txt`
-----------------------------+-----------------
     Reporter:  herzi        |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 Section 4.2. (“CERTS cells”) of`tor-spec.txt` contains the phrase:

 {{{
 The certificate format for the above certificate types is X509.
 }}}

 However, X.509 certificates can be uncoded in a number of different
 formats, DER being the one that's used with Tor.

 See the attached patch to improve the sentence like this:

 {{{
 The certificate format for the above certificate types is DER encoded
 X509.
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18057>
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