Clarify docs for GraphQL Query.vulnerabilities

doc/api/graphql/reference/gitlab_schema.graphql

@@ -10265,7 +10265,7 @@ type Group {
     reportType: [VulnerabilityReportType!]
 
     """
-    Filter vulnerabilities by scanner
+    Filter vulnerabilities by VulnerabilityScanner.externalId
     """
     scanner: [String!]
 
@@ -17843,7 +17843,7 @@ type Project {
     reportType: [VulnerabilityReportType!]
 
     """
-    Filter vulnerabilities by scanner
+    Filter vulnerabilities by VulnerabilityScanner.externalId
     """
     scanner: [String!]
 
@@ -19031,7 +19031,7 @@ type Query {
     reportType: [VulnerabilityReportType!]
 
     """
-    Filter vulnerabilities by scanner
+    Filter vulnerabilities by VulnerabilityScanner.externalId
     """
     scanner: [String!]
 

doc/api/graphql/reference/gitlab_schema.json

@@ -28185,7 +28185,7 @@
                 },
                 {
                   "name": "scanner",
-                  "description": "Filter vulnerabilities by scanner",
+                  "description": "Filter vulnerabilities by VulnerabilityScanner.externalId",
                   "type": {
                     "kind": "LIST",
                     "name": null,
@@ -52204,7 +52204,7 @@
                 },
                 {
                   "name": "scanner",
-                  "description": "Filter vulnerabilities by scanner",
+                  "description": "Filter vulnerabilities by VulnerabilityScanner.externalId",
                   "type": {
                     "kind": "LIST",
                     "name": null,
@@ -55577,7 +55577,7 @@
                 },
                 {
                   "name": "scanner",
-                  "description": "Filter vulnerabilities by scanner",
+                  "description": "Filter vulnerabilities by VulnerabilityScanner.externalId",
                   "type": {
                     "kind": "LIST",
                     "name": null,

ee/app/graphql/resolvers/vulnerabilities_resolver.rb

@@ -24,7 +24,7 @@ module Resolvers
 
     argument :scanner, [GraphQL::STRING_TYPE],
              required: false,
-             description: 'Filter vulnerabilities by scanner'
+             description: 'Filter vulnerabilities by VulnerabilityScanner.externalId'
 
     argument :sort, Types::VulnerabilitySortEnum,
              required: false,