Update rustc man page to match rustc --help
          #100037
        
          
      
                
     Merged
            
            
          
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This brings the
--crate-type,--emit, and--printoptions' allowed arguments into sync with that printed byrustc --help.c.f. the
opt::multi_scalls for"crate-type","emit", and"print"here: https://github.com/rust-lang/rust/blob/master/compiler/rustc_session/src/config.rs