Added more text about nested suites behavior to Framework scaladoc.
Added more text about nested suites behavior to Framework scaladoc.

matterche/scalatest,rahulkavale/scalatest,cheeseng/scalatest,SRGOM/scalatest,rfries/scalatest,SRGOM/scalatest,dotty-staging/scalatest,cheeseng/scalatest,triggerNZ/scalatest,matterche/scalatest,gcberger/scalatest,janekdb/scalatest,dotty-staging/scalatest,cheeseng/scalatest,gcberger/scalatest,scalatest/scalatest,rahulkavale/scalatest,scalatest/scalatest,rahulkavale/scalatest,rfries/scalatest,triggerNZ/scalatest,matterche/scalatest,SRGOM/scalatest,janekdb/scalatest,triggerNZ/scalatest,matterche/scalatest,flicken/scalatest,flicken/scalatest,gcberger/scalatest,rfries/scalatest,flicken/scalatest,scalatest/scalatest,flicken/scalatest,rfries/scalatest,janekdb/scalatest,gcberger/scalatest,rahulkavale/scalatest,SRGOM/scalatest,dotty-staging/scalatest,triggerNZ/scalatest,janekdb/scalatest