symbolic_solve docstring update (using Nemo and using Groebner)

[n0rbed]

Added notes to inform users about the necessity of using Nemo and Groebner when using symbolic_solve

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.88%. Comparing base (47cfd60) to head (e6d36a9).
Report is 44 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1249       +/-   ##
===========================================
+ Coverage    8.30%   79.88%   +71.57%     
===========================================
  Files          46       46               
  Lines        4549     4644       +95     
===========================================
+ Hits          378     3710     +3332     
+ Misses       4171      934     -3237     

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