docs: correct casing of "BigQuery" (#604)

Fixes #603

Author: stephenplusplus

handwritten/bigquery/.repo-metadata.json

@@ -1,6 +1,6 @@
 {
   "name": "bigquery",
-  "name_pretty": "Google Cloud Bigquery",
+  "name_pretty": "Google Cloud BigQuery",
   "product_documentation": "https://cloud.google.com/bigquery",
   "client_documentation": "https://googleapis.dev/nodejs/bigquery/latest",
   "issue_tracker": "https://issuetracker.google.com/savedsearches/559654",
@@ -10,4 +10,4 @@
   "distribution_name": "@google-cloud/bigquery",
   "api_id": "bigquery.googleapis.com",
   "requires_billing": false
-}
+}