Document 'shell_escape_cwd' for Tectonic.toml

[eljamm]

The 'shell_escape_cwd' output specification is implemented, but is not documented for Tectonic.toml.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7931a85) 46.27% compared to head (f1069bf) 46.27%.
Report is 40 commits behind head on master.

❗ Current head f1069bf differs from pull request most recent head 61c062d. Consider uploading reports for the commit 61c062d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1116      +/-   ##
==========================================
- Coverage   46.27%   46.27%   -0.01%     
==========================================
  Files         171      171              
  Lines       65139    65139              
==========================================
- Hits        30144    30143       -1     
- Misses      34995    34996       +1     

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[pkgw]

Thanks! I'm going to close and open this to get the CI to rerun; hopefully the PR that I just merged will make Clippy happy.