option: tiny spelling mistake fix.

Change-Id: Ica9374ea29d83b7402edd50e8d9bfb8e3df877c7
Reviewed-on: https://code-review.googlesource.com/c/google-api-go-client/+/48813
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/option/option.go b/option/option.go
index 8a4cd16..0d9ae4e 100644
--- a/option/option.go
+++ b/option/option.go
@@ -114,7 +114,7 @@
 }
 
 // WithGRPCConn returns a ClientOption that specifies the gRPC client
-// connection to use as the basis of communications. This option many only be
+// connection to use as the basis of communications. This option may only be
 // used with services that support gRPC as their communication transport. When
 // used, the WithGRPCConn option takes precedent over all other supplied
 // options.