Fix spelling of search terms and add term "diagnostic" for healthcare=laboratory preset (#1826)

Author: matkoniecz

data/presets/healthcare/laboratory.json

@@ -18,9 +18,10 @@
         "area"
     ],
     "terms": [
-        "blood_check",
-        "medical_lab",
-        "medical_laboratory"
+        "blood check",
+        "diagnostic",
+        "medical lab",
+        "medical laboratory"
     ],
     "tags": {
         "healthcare": "laboratory"