Fix link to test_grok_pattern api (#105174)

rest-api-spec/src/main/resources/rest-api-spec/api/text_structure.test_grok_pattern.json

@@ -1,7 +1,7 @@
 {
   "text_structure.test_grok_pattern": {
     "documentation": {
-      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/test-grok-pattern-api.html",
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/master/test-grok-pattern.html",
       "description": "Tests a Grok pattern on some text."
     },
     "stability": "stable",