Clarify "DAG dependency order" in docstrings

[Yoshanuikabundi]

Fixes #223

[pep8speaks]

Hello @Yoshanuikabundi! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file gufe/protocols/protocoldag.py:

Line 66:80: E501 line too long (80 > 79 characters)
Line 163:80: E501 line too long (80 > 79 characters)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (dcc7896) 99.18% compared to head (ad6f345) 99.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #244   +/-   ##
=======================================
  Coverage   99.18%   99.18%           
=======================================
  Files          36       36           
  Lines        1838     1838           
=======================================
  Hits         1823     1823           
  Misses         15       15           

Files	Coverage Δ
gufe/protocols/protocoldag.py	100.00% <ø> (ø)

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[dwhswenson]

lgtm; thanks!