OVERVIEW.md in google-apis-spanner_v1-0.21.0 vs OVERVIEW.md in google-apis-spanner_v1-0.22.0

@@ -49,10 +49,10 @@
 
 # Create a client object
 client = Google::Apis::SpannerV1::SpannerService.new
 
 # Authenticate calls
-client.authentication = # ... use the googleauth gem to create credentials
+client.authorization = # ... use the googleauth gem to create credentials
 ```
 
 See the class reference docs for information on the methods you can call from a client.
 
 ## Documentation