Fixed broken link in Source Bigquery spec (#7165)

Author: s-mawjee

airbyte-integrations/connectors/source-bigquery/src/main/resources/spec.json

@@ -1,5 +1,5 @@
 {
-  "documentationUrl": "https://docs.airbyte.io/integrations/source/bigquery",
+  "documentationUrl": "https://docs.airbyte.io/integrations/sources/bigquery",
   "supportsIncremental": true,
   "supportsNormalization": true,
   "supportsDBT": true,
@@ -23,7 +23,7 @@
       },
       "credentials_json": {
         "type": "string",
-        "description": "The contents of the JSON service account key. Check out the <a href=\"https://docs.airbyte.io/integrations/source/bigquery\">docs</a> if you need help generating this key.",
+        "description": "The contents of the JSON service account key. Check out the <a href=\"https://docs.airbyte.io/integrations/sources/bigquery#setup-the-bigquery-source-in-airbyte\">docs</a> if you need help generating this key.",
         "title": "Credentials JSON",
         "airbyte_secret": true
       }