TYP/DOC: Improve typign and docs #460
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4 errors and 2 warnings
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                          windows-latest, Python cp311
                        
                      
                       
                  Command python -c "import linearmodels; linearmodels.test(['--skip-examples','--skip-slow','-n','2'])" failed with code 1. None 
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                          windows-latest, Python cp311
                        
                      
                       
                  Process completed with exit code 1. 
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                          ubuntu-latest, Python cp311
                        
                      
                       
                  Command ['sh', '-c', 'python -c "import linearmodels; linearmodels.test([\'--skip-examples\',\'--skip-slow\',\'-n\',\'2\'])"'] failed with code 1.  
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                          ubuntu-latest, Python cp311
                        
                      
                       
                  Process completed with exit code 1. 
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                          windows-latest, Python cp311
                        
                      
                       
                  The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-python@v4. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/ 
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                          ubuntu-latest, Python cp311
                        
                      
                       
                  The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-python@v4. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/ 
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