Fixes the docstring rendering for GAE apps

[sighingnow]

What do these changes do?

as titled.

Related issue number

N/A

[codecov-commenter]

Codecov Report

Merging #2131 (ac60abb) into main (950ed7a) will increase coverage by 27.39%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2131       +/-   ##
===========================================
+ Coverage   43.86%   71.26%   +27.39%     
===========================================
  Files          87       89        +2     
  Lines        9904     9941       +37     
===========================================
+ Hits         4344     7084     +2740     
+ Misses       5560     2857     -2703     

Impacted Files	Coverage Δ
python/graphscope/analytical/app/__init__.py	100.00% <ø> (ø)
python/graphscope/framework/app.py	90.32% <ø> (+9.67%)	⬆️
python/graphscope/framework/context.py	66.38% <ø> (+21.75%)	⬆️
python/graphscope/framework/graph.py	84.76% <ø> (+15.03%)	⬆️
python/graphscope/tests/unittest/test_java_app.py	49.33% <0.00%> (-50.67%)	⬇️
python/graphscope/analytical/app/java_app.py	24.36% <0.00%> (-44.68%)	⬇️
python/graphscope/client/rpc.py	88.88% <0.00%> (-0.93%)	⬇️
python/graphscope/version.py	100.00% <0.00%> (ø)
python/graphscope/__init__.py	82.14% <0.00%> (ø)
python/graphscope/framework/dag.py	81.63% <0.00%> (+1.02%)	⬆️
... and 42 more

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