docs: add dPIEMassLenstool / dPIEMassLenstoolSph to mass API autosummary

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PUuWXiS23FvmfQPLvMNjeM

Author: 2 people

docs/api/mass.rst

@@ -24,6 +24,8 @@ Total [ag.mp]
    IsothermalSph
    dPIEMass
    dPIEMassSph
+   dPIEMassLenstool
+   dPIEMassLenstoolSph
    PIEMass
    dPIEPotential
    dPIEPotentialSph