Update doc to include units

Framework/DataObjects/src/Peak.cpp

@@ -707,13 +707,13 @@ void Peak::setMonitorCount(double m_monitorCount) {
 }
 
 //----------------------------------------------------------------------------------------------
-/** Get the final neutron energy */
+/** Get the final neutron energy in meV */
 double Peak::getFinalEnergy() const { return m_finalEnergy; }
 
-/** Get the initial (incident) neutron energy */
+/** Get the initial (incident) neutron energy in meV */
 double Peak::getInitialEnergy() const { return m_initialEnergy; }
 
-/** Get the difference between the initial and final neutron energy */
+/** Get the difference between the initial and final neutron energy in meV */
 double Peak::getEnergyTransfer() const {
   return getInitialEnergy() - getFinalEnergy();
 }

Framework/PythonInterface/mantid/api/src/Exports/IPeak.cpp

@@ -125,17 +125,17 @@ void export_IPeak() {
            "microseconds) of the neutrons for this "
            "peak")
       .def("getInitialEnergy", &IPeak::getInitialEnergy, arg("self"),
-           "Get the initial (incident) neutron energy")
+           "Get the initial (incident) neutron energy in meV.")
       .def("getFinalEnergy", &IPeak::getFinalEnergy, arg("self"),
-           "Get the final neutron energy")
+           "Get the final neutron energy in meV.")
       .def("getEnergyTransfer", &IPeak::getEnergyTransfer, arg("self"),
-           "Get the initial neutron energy minus the final neutron energy."
+           "Get the initial neutron energy minus the final neutron energy in meV."
            "\n\n.. versionadded:: 3.12.0")
       .def("setInitialEnergy", &IPeak::setInitialEnergy,
            (arg("self"), arg("initial_energy")),
-           "Set the initial (incident) neutron energy")
+           "Set the initial (incident) neutron energy in meV.")
       .def("setFinalEnergy", &IPeak::setFinalEnergy,
-           (arg("self"), arg("final_energy")), "Set the final neutron energy")
+           (arg("self"), arg("final_energy")), "Set the final neutron energy in meV.")
       .def("getIntensity", &IPeak::getIntensity, arg("self"),
            "Return the integrated peak intensity")
       .def("getSigmaIntensity", &IPeak::getSigmaIntensity, arg("self"),