Update simpeg_drivers-assets/uijson/joint_surveys_inversion.ui.json

Co-authored-by: domfournier <dominiquef@mirageoscience.com>

Author: benk-mira

simpeg_drivers-assets/uijson/joint_surveys_inversion.ui.json

@@ -76,7 +76,7 @@
         "main": true,
         "group": "Mesh and models",
         "label": "Model units",
-        "tooltip": "Allows users to enter resistivity values for conductivity inversions.",
+        "tooltip": "Change the model units between S/m or Ohm.m, for electromagnetic and direct-current surveys.",
         "optional": true,
         "enabled": false,
         "value": "Conductivity (S/m)"