In configure.py, print info on --config=v1 instead of --config=v2.

Explicitly listing --config=v2 incorrectly implied that building for TF2 was not the default.

PiperOrigin-RevId: 381038392
Change-Id: I6400a8edf40a7941d3b5132388d44f7aae698ea5
diff --git a/configure.py b/configure.py
index c675953..4f096b8 100644
--- a/configure.py
+++ b/configure.py
@@ -1466,7 +1466,7 @@
   config_info_line(
       'dynamic_kernels',
       '(Experimental) Build kernels into separate shared objects.')
-  config_info_line('v2', 'Build TensorFlow 2.x instead of 1.x.')
+  config_info_line('v1', 'Build with TensorFlow 1 API instead of TF 2 API.')
 
   print('Preconfigured Bazel build configs to DISABLE default on features:')
   config_info_line('nogcp', 'Disable GCP support.')