Improve verbiage of dropsegments sanity error

Marlin/SanityCheck.h

@@ -134,7 +134,7 @@
 #elif defined(Z_RAISE_PROBE_DEPLOY_STOW) || defined(Z_RAISE_BETWEEN_PROBINGS)
   #error "Z_RAISE_PROBE_DEPLOY_STOW and Z_RAISE_BETWEEN_PROBINGS are now Z_PROBE_DEPLOY_HEIGHT and Z_PROBE_TRAVEL_HEIGHT Please update your configuration."
 #elif !defined(MIN_STEPS_PER_SEGMENT)
-  #error "dropsegments" is replaced with MIN_STEPS_PER_SEGMENT (and increases by 1). Please update Configuration_adv.h.
+  #error Please replace "const int dropsegments" with "#define MIN_STEPS_PER_SEGMENT" (and increase by 1) in Configuration_adv.h.
 #elif defined(PREVENT_DANGEROUS_EXTRUDE)
   #error "PREVENT_DANGEROUS_EXTRUDE is now PREVENT_COLD_EXTRUSION. Please update your configuration."
 #endif