Refs #9583 fix html documentation errors
refs #9583 fix links in PeakIntensityVsRadius
Refs #9583 fix more links
Refs #9583 add rst files for mpi algorithms
Refs #9583 tests for 3 algorithms
Merge branch 'feature/9583_documentation_check' of github.com:mantidproject/mantid into feature/9583_documentation_check
Merge branch 'feature/9583_documentation_check' into develop