Fix prior_shrinkage documentation

[gowerc]

Closes #377

written formula in the documentation was wrong, this fixes that

[github-actions]

Code Coverage Summary

Filename                           Stmts    Miss  Cover    Missing
-------------------------------  -------  ------  -------  --------------------------------
R/brier_score.R                      167       0  100.00%
R/DataJoint.R                         76       2  97.37%   264, 270
R/DataLongitudinal.R                 119       1  99.16%   244
R/DataSubject.R                       85       1  98.82%   142
R/DataSurvival.R                      98       0  100.00%
R/defaults.R                          10       6  40.00%   18-57, 84
R/generics.R                          34       4  88.24%   52, 396, 416, 471
R/Grid.R                              27       1  96.30%   173
R/GridEven.R                          32       0  100.00%
R/GridEvent.R                         22       0  100.00%
R/GridFixed.R                         30       0  100.00%
R/GridGrouped.R                       52       0  100.00%
R/GridManual.R                        23       3  86.96%   78-80
R/GridObserved.R                      20       0  100.00%
R/GridPopulation.R                    31       4  87.10%   61, 69-71
R/GridPrediction.R                    36       6  83.33%   83, 91-95
R/JointModel.R                       126      10  92.06%   146-151, 201, 205, 247, 293, 299
R/JointModelSamples.R                 66       0  100.00%
R/link_generics.R                     13       3  76.92%   59, 76, 91
R/Link.R                              62       4  93.55%   200-203
R/LinkComponent.R                     19       3  84.21%   88, 120-121
R/LongitudinalClaretBruno.R           88       6  93.18%   164-168, 183
R/LongitudinalGSF.R                   89       0  100.00%
R/LongitudinalModel.R                 19       0  100.00%
R/LongitudinalQuantities.R            71       0  100.00%
R/LongitudinalRandomSlope.R           44       5  88.64%   102-106
R/LongitudinalSteinFojo.R             80       5  93.75%   155-159
R/Parameter.R                         14       0  100.00%
R/ParameterList.R                     42       1  97.62%   184
R/Prior.R                            254       6  97.64%   507, 651-665
R/Promise.R                           25       0  100.00%
R/Quantities.R                        60       0  100.00%
R/QuantityGeneratorPopulation.R       22       0  100.00%
R/QuantityGeneratorPrediction.R       48       0  100.00%
R/QuantityGeneratorSubject.R          19       0  100.00%
R/settings.R                          12      12  0.00%    55-69
R/SimGroup.R                           5       0  100.00%
R/SimJointData.R                      72       1  98.61%   103
R/SimLongitudinal.R                    5       2  60.00%   22, 40
R/SimLongitudinalClaretBruno.R        52       0  100.00%
R/SimLongitudinalGSF.R                60       0  100.00%
R/SimLongitudinalRandomSlope.R        42       0  100.00%
R/SimLongitudinalSteinFojo.R          50       0  100.00%
R/SimSurvival.R                      104       0  100.00%
R/StanModel.R                         15       0  100.00%
R/StanModule.R                       176       6  96.59%   192-193, 235, 246, 383, 411
R/SurvivalExponential.R               10       0  100.00%
R/SurvivalLoglogistic.R               11       0  100.00%
R/SurvivalModel.R                     19       0  100.00%
R/SurvivalQuantities.R               170       1  99.41%   125
R/SurvivalWeibullPH.R                 11       0  100.00%
R/utilities.R                        144       2  98.61%   13, 335
R/zzz.R                               28      25  10.71%   3, 8-12, 14-35, 47
TOTAL                               3009     120  96.01%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 3d78ae9

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

    1 files    160 suites   6m 20s ⏱️
  139 tests   136 ✅ 3 💤 0 ❌
1 051 runs  1 047 ✅ 4 💤 0 ❌

Results for commit 3d78ae9.

[github-actions]

Unit Test Performance Difference

Test Suite	$Status$	Time on main	$±Time$	$±Tests$	$±Skipped$	$±Failures$	$±Errors$
compile	💚	$6.51$	$-1.05$	$0$	$0$	$0$	$0$
extract_quantities	💚	$4.21$	$-4.16$	$0$	$0$	$0$	$0$
misc_models	💔	$6.04$	$+3.54$	$0$	$0$	$0$	$0$
model_multi_chain	💔	$2.18$	$+25.59$	$0$	$0$	$0$	$0$

Additional test case details

Test Suite	$Status$	Time on main	$±Time$	Test Case
Grid	💚	$50.01$	$-1.39$	Grid_objects_work_with_QuantityGenerator_and_QuantityCollapser
GridPrediction	💔	$116.97$	$+2.56$	GridPrediction_works_as_expected_for_Survival_models
LongitudinalQuantiles	💔	$6.66$	$+1.59$	Test_that_LongitudinalQuantities_works_as_expected
LongitudinalRandomSlope	💚	$9.64$	$-4.39$	Print_method_for_LongitudinalRandomSlope_works_as_expected
SurvivalExponential	💔	$21.79$	$+1.13$	SurvivalExponential_can_recover_true_parameter_including_covariates_
SurvivalLoglogistic	💔	$13.99$	$+5.29$	sim_os_loglogistic_is_consistant_with_flexsurv
compile	💚	$6.51$	$-1.05$	compileStanModel_doesn_t_error_if_the_directory_doesn_t_exist
extract_quantities	💚	$4.21$	$-4.16$	extract_quantities_works_as_expected
misc_models	💔	$6.04$	$+3.54$	Longitudinal_Model_doesn_t_print_sampler_rejection_messages
model_multi_chain	💔	$2.18$	$+25.59$	Can_recover_known_distribution_parameters_from_random_slope_model_when_using_multiple_chains
stan_functions	💚	$27.47$	$-27.03$	GSF_SLD_function_works_as_expected

Results for commit 65e13b1

♻️ This comment has been updated with latest results.