Fix docs and examples

[blink1073]

• Force webpack to use a supported algorithm for hashing
• Fix some docstrings in sessionmanager.py.

[codecov]

Codecov Report

Base: 80.19% // Head: 80.17% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (7466d23) compared to base (bc735a1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1183      +/-   ##
==========================================
- Coverage   80.19%   80.17%   -0.03%     
==========================================
  Files          68       68              
  Lines        8150     8150              
  Branches     1605     1605              
==========================================
- Hits         6536     6534       -2     
- Misses       1188     1189       +1     
- Partials      426      427       +1     

Impacted Files	Coverage Δ
jupyter_server/services/sessions/sessionmanager.py	88.36% <ø> (ø)
jupyter_server/serverapp.py	79.92% <0.00%> (-0.18%)	⬇️

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