Add comments to needReseThis PR is to add comments to needResetReservedPorts in fluid/pkg/ddc/base/portallocator/bitmap_allocator.go.tReservedPorts in fluid/pkg/ddc/base/portallo…

Add comments to needReseThis PR is to add comments to needResetReservedPorts in fluid/pkg/ddc/base/portallocator/bitmap_allocator.go.tReservedPorts in fluid/pkg/ddc/base/portallo… #4368