Clarify tutorial wording for beginners

This change slightly clarifies wording in the tutorial to make it easier for beginners to understand which parts of the examples they should type into the interpreter.

Author: Hamza-CS50

Doc/tutorial/introduction.rst

@@ -6,7 +6,7 @@ An Informal Introduction to Python
 
 In the following examples, input and output are distinguished by the presence or
 absence of prompts (:term:`>>>` and :term:`...`): to repeat the example, you must type
-everything after the prompt, when the prompt appears; lines that do not begin
+everything shown after the prompt, when the prompt appears; lines that do not begin
 with a prompt are output from the interpreter. Note that a secondary prompt on a
 line by itself in an example means you must type a blank line; this is used to
 end a multi-line command.