docs: Add missing code block in docs/README.rst

PiperOrigin-RevId: 602884629

Author: vertex-sdk-bot

README.rst

@@ -107,7 +107,7 @@ If none of the above scenarios could help you find the right tools for your task
 
 Importing
 ^^^^^^^^^
-Vertex AI SDK functionality can be used by importing the following namespace:
+Vertex AI SDK resource based functionality can be used by importing the following namespace:
 
 .. code-block:: Python
 
@@ -119,7 +119,7 @@ Vertex AI SDK preview functionality can be used by importing the following names
 
     from vertexai import preview
 
-Vertex AI client library functionality can be used by importing the following namespace:
+Vertex AI SDK general availability (GA) functionality can be used by importing the following namespace:
 
 .. code-block:: Python
 

docs/README.rst

@@ -101,7 +101,7 @@ If none of the above scenarios could help you find the right tools for your task
 
 Importing
 ^^^^^^^^^
-Vertex AI SDK functionality can be used by importing the following namespace:
+Vertex AI SDK resource based functionality can be used by importing the following namespace:
 
 .. code-block:: Python
 
@@ -113,10 +113,11 @@ Vertex AI SDK preview functionality can be used by importing the following names
 
     from vertexai import preview
 
-Vertex AI client library functionality can be used by importing the following namespace:
+Vertex AI SDK general availability (GA) functionality can be used by importing the following namespace:
 
 .. code-block:: Python
 
+    import vertexai
 
 Initialization
 ^^^^^^^^^^^^^^