fix pw2wan input files in SCDM example 27

[qiaojunfeng]

In this commit:

1. the keyword scdm_entanglement are correctly quoted
2. the corresponding tutorial.tex is updated

[codecov]

Codecov Report

Merging #306 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop    #306   +/-   ##
=======================================
  Coverage     65.6%   65.6%           
=======================================
  Files           29      29           
  Lines        17938   17938           
=======================================
  Hits         11768   11768           
  Misses        6170    6170

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