Minor swagger docs fixes & improvements (#6453)

[skip ci]

* fix spelling movieFiles -> moveFiles

* improve /queue/grab/ description

src/Radarr.Api.V3/swagger.json

@@ -136,7 +136,7 @@
         "parameters": [
           {
             "in": "query",
-            "name": "movieFiles",
+            "name": "moveFiles",
             "schema": {
               "type": "boolean"
             },
@@ -3688,7 +3688,7 @@
             "apikey": []
           }
         ],
-        "description": "Force grab pending queue item by Id",
+        "description": "Perform a Radarr \"force grab\" on a pending queue item by its ID.",
         "tags": [
           "Queue"
         ]