Apply suggestions from code review
Apply suggestions from code review

Add type hint to getFixtures() and adjust doc block

Co-Authored-By: ADmad <b0bb59b9d3e7afa55328c83288c17a33af23dcc6@users.noreply.github.com>
Co-Authored-By: Mark Story <f1b5a91d4d6ad523f2610114591c007e75d15084@mark-story.com>
cakephp/cakephp,CakeDC/cakephp,ndm2/cakephp,ADmad/cakephp,ADmad/cakephp,cakephp/cakephp,CakeDC/cakephp,ADmad/cakephp,ndm2/cakephp,ndm2/cakephp,ADmad/cakephp,cakephp/cakephp,CakeDC/cakephp,cakephp/cakephp,ndm2/cakephp,CakeDC/cakephp