Document EarlyBinder::subst_identity and skip_binder
          #106953
        
          
      
                
     Merged
            
            
          
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Finishing implementing #105779 will change several commonly used queries to return
EarlyBinderby default. This PR adds documentation for two of the methods used to access data inside theEarlyBinder. I tried to summarize some of the discussion from the issue in writing this.r? @lcnr