fix(clinic.json): change dialysis to nephrology

...for `"healthcare:speciality"`

Close #7788

Related: openstreetmap/id-tagging-schema#795

Author: LaoshuBaby

data/operators/amenity/clinic.json

@@ -291,7 +291,7 @@
       "tags": {
         "amenity": "clinic",
         "healthcare": "dialysis",
-        "healthcare:speciality": "dialysis",
+        "healthcare:speciality": "nephrology",
         "name": "DaVita Dialysis",
         "operator": "DaVita Dialysis",
         "operator:wikidata": "Q5207184"
@@ -338,7 +338,7 @@
       "tags": {
         "amenity": "clinic",
         "healthcare": "dialysis",
-        "healthcare:speciality": "dialysis",
+        "healthcare:speciality": "nephrology",
         "name": "Dialysis Clinic",
         "operator": "Dialysis Clinic",
         "operator:wikidata": "Q5270633",
@@ -441,7 +441,7 @@
       "tags": {
         "amenity": "clinic",
         "healthcare": "dialysis",
-        "healthcare:speciality": "dialysis",
+        "healthcare:speciality": "nephrology",
         "name": "Fresenius Kidney Care",
         "operator": "Fresenius Kidney Care",
         "operator:wikidata": "Q650259"
@@ -454,7 +454,7 @@
       "tags": {
         "amenity": "clinic",
         "healthcare": "dialysis",
-        "healthcare:speciality": "dialysis",
+        "healthcare:speciality": "nephrology",
         "name": "Fresenius Medical Care",
         "operator": "Fresenius Medical Care",
         "operator:wikidata": "Q650259"
@@ -1646,7 +1646,7 @@
       "tags": {
         "amenity": "clinic",
         "healthcare": "dialysis",
-        "healthcare:speciality": "dialysis",
+        "healthcare:speciality": "nephrology",
         "name": "Satellite Healthcare",
         "operator": "Satellite Healthcare",
         "operator:wikidata": "Q50039787"