Improve some probe sanity errors

Marlin/src/inc/SanityCheck.h

 #elif defined(UBL_PROBE_PT_1_X) || defined(UBL_PROBE_PT_1_Y) || defined(UBL_PROBE_PT_2_X) || defined(UBL_PROBE_PT_2_Y) || defined(UBL_PROBE_PT_3_X) || defined(UBL_PROBE_PT_3_Y)
   #error "UBL_PROBE_PT_[123]_[XY] is no longer required. Please remove it from Configuration.h."
 #elif defined(LEFT_PROBE_BED_POSITION)
-  #error "LEFT_PROBE_BED_POSITION has been replaced by MIN_PROBE_EDGE_LEFT. Please update your configuration."
+  #error "LEFT_PROBE_BED_POSITION is obsolete. Set a margin with MIN_PROBE_EDGE or MIN_PROBE_EDGE_LEFT instead."
 #elif defined(RIGHT_PROBE_BED_POSITION)
-  #error "RIGHT_PROBE_BED_POSITION has been replaced by MIN_PROBE_EDGE_RIGHT. Please update your configuration."
+  #error "RIGHT_PROBE_BED_POSITION is obsolete. Set a margin with MIN_PROBE_EDGE or MIN_PROBE_EDGE_RIGHT instead."
 #elif defined(FRONT_PROBE_BED_POSITION)
-  #error "FRONT_PROBE_BED_POSITION has been replaced by MIN_PROBE_EDGE_FRONT. Please update your configuration."
+  #error "FRONT_PROBE_BED_POSITION is obsolete. Set a margin with MIN_PROBE_EDGE or MIN_PROBE_EDGE_FRONT instead."
 #elif defined(BACK_PROBE_BED_POSITION)
-  #error "BACK_PROBE_BED_POSITION has been replaced by MIN_PROBE_EDGE_BACK. Please update your configuration."
+  #error "BACK_PROBE_BED_POSITION is obsolete. Set a margin with MIN_PROBE_EDGE or MIN_PROBE_EDGE_BACK instead."
 #elif defined(ENABLE_MESH_EDIT_GFX_OVERLAY)
   #error "ENABLE_MESH_EDIT_GFX_OVERLAY is now MESH_EDIT_GFX_OVERLAY. Please update your configuration."
 #elif defined(BABYSTEP_ZPROBE_GFX_REVERSE)