Enclose #error strings with apostrophes in quotes

Marlin/SanityCheck.h

@@ -240,9 +240,9 @@
    * Don't allow nonsense probe-pin settings
    */
   #if ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN) && ENABLED(Z_MIN_PROBE_ENDSTOP)
-    #error You can't enable both Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN and Z_MIN_PROBE_ENDSTOP.
+    #error "You can't enable both Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN and Z_MIN_PROBE_ENDSTOP."
   #elif ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN) && ENABLED(DISABLE_Z_MIN_PROBE_ENDSTOP)
-    #error Don't enable DISABLE_Z_MIN_PROBE_ENDSTOP with Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN.
+    #error "Don't enable DISABLE_Z_MIN_PROBE_ENDSTOP with Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN."
   #elif ENABLED(DISABLE_Z_MIN_PROBE_ENDSTOP) && DISABLED(Z_MIN_PROBE_ENDSTOP)
     #error DISABLE_Z_MIN_PROBE_ENDSTOP requires Z_MIN_PROBE_ENDSTOP to be set.
   #endif
@@ -252,7 +252,7 @@
    */
   #if ENABLED(Z_MIN_PROBE_ENDSTOP)
     #if !HAS_Z_MIN_PROBE_PIN
-      #error Z_MIN_PROBE_ENDSTOP requires a Z_MIN_PROBE_PIN in your board's pins_XXXX.h file.
+      #error "Z_MIN_PROBE_ENDSTOP requires a Z_MIN_PROBE_PIN in your board's pins_XXXX.h file."
     #endif
     // Forcing Servo definitions can break some hall effect sensor setups. Leaving these here for further comment.
     //#ifndef NUM_SERVOS