goto-analyzer.md: fix typos in examples

[rurban]

--vsd-struct => --vsd-structs

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[tautschnig]

Thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.66%. Comparing base (08b2f2f) to head (4578aa7).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8255      +/-   ##
===========================================
+ Coverage    79.64%   79.66%   +0.01%     
===========================================
  Files         1684     1683       -1     
  Lines       195684   195713      +29     
===========================================
+ Hits        155852   155913      +61     
+ Misses       39832    39800      -32     

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