[Varnish] #974: Add new ESI syntax to the upgrade page

[Varnish]

#974: Add new ESI syntax to the upgrade page
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  Reporter:  smerrill  |        Type:  documentation
    Status:  closed    |    Priority:  low          
 Milestone:            |   Component:  documentation
   Version:  3.0.0     |    Severity:  minor        
Resolution:  fixed     |    Keywords:               
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Changes (by Tollef Fog Heen <tfheen@…>):

  * status:  new => closed
  * resolution:  => fixed


Comment:

 (In [d6a5687f01bd09d96a868820c11beaf0c518ee5d]) Document do_esi

 Put esi → do_esi in upgrade checklist, fix markup typo.

 Fixes #974

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Ticket URL: </ticket/974#comment:1>
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