Add troubleshooting for long names in the solver

[datejada]

This pull request includes updates to the documentation to address a common solver error and provide guidance on changing solver parameters in SpineOpt.

Documentation updates:

• docs/src/getting_started/troubleshooting.md: Added a new section to address the "Name too long" error thrown by solvers and provided a solution using solver parameters.
• docs/src/how_to/change_the_solver.md: Updated the header to include an encoded reference for easier navigation within the documentation.

Fixes #1126

Checklist before merging

• Documentation is up-to-date
• Unit tests have been added/updated accordingly
• Code has been formatted according to SpineOpt's style
• Unit tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.33%. Comparing base (066b894) to head (591e6f5).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1134   +/-   ##
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  Coverage   87.33%   87.33%           
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  Files         143      143           
  Lines        4137     4137           
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  Hits         3613     3613           
  Misses        524      524           

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