show explicit formulas in documentation of WeierstrassIsomorphism

[yyyyx4]

Fixes #34439.

[kwankyu]

LGTM.

[codecov-commenter]

Codecov Report

Base: 88.59% // Head: 88.59% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (a89cc3c) compared to base (64cfac5).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head a89cc3c differs from pull request most recent head 83581fa. Consider uploading reports for the commit 83581fa to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #34967      +/-   ##
===========================================
- Coverage    88.59%   88.59%   -0.01%     
===========================================
  Files         2136     2136              
  Lines       396142   396141       -1     
===========================================
- Hits        350979   350954      -25     
- Misses       45163    45187      +24     

Impacted Files	Coverage Δ
...ge/schemes/elliptic_curves/weierstrass_morphism.py	93.01% <100.00%> (ø)
...e/combinat/cluster_algebra_quiver/mutation_type.py	50.11% <0.00%> (-3.69%)	⬇️
src/sage/modular/arithgroup/congroup_gamma0.py	94.41% <0.00%> (-0.56%)	⬇️
src/sage/matrix/matrix_integer_dense_hnf.py	85.71% <0.00%> (-0.51%)	⬇️
src/sage/cpython/_py2_random.py	76.03% <0.00%> (-0.42%)	⬇️
src/sage/graphs/generic_graph.py	89.12% <0.00%> (-0.40%)	⬇️
src/sage/schemes/elliptic_curves/cardinality.py	87.00% <0.00%> (-0.40%)	⬇️
src/sage/schemes/elliptic_curves/hom_velusqrt.py	94.09% <0.00%> (-0.40%)	⬇️
src/sage/matrix/special.py	93.62% <0.00%> (-0.27%)	⬇️
src/sage/schemes/elliptic_curves/ell_point.py	84.49% <0.00%> (-0.14%)	⬇️
... and 13 more

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[yyyyx4]

The test failure is unrelated (see #35017).