Use birthday, not age on original example (#414)

Author: sydney-runkle

CONTRIBUTING.md

@@ -5,7 +5,7 @@ We'd love anyone interested to contribute to the Logfire SDK and documentation.
 ## How to contribute
 
 1. Fork and clone the repository
-2. [Install Rye](https://rye-up.com/guide/basics/)
+2. [Install Rye](https://rye.astral.sh/guide/installation/)
 3. Run `make install` to install dependencies
 4. Run `make test` to run unit tests
 5. Run `make format` to format code

docs/index.md

@@ -80,8 +80,8 @@ logfire.configure()  # (1)!
 
 logfire.info('Hello, {name}!', name='world')  # (2)!
 
-with logfire.span('Asking the user their {question}', question='age'):  # (3)!
-    user_input = input('How old are you [YYYY-mm-dd]? ')
+with logfire.span('Asking the user for their {question}', question='birthday'):  # (3)!
+    user_input = input('When were you born [YYYY-mm-dd]? ')
     dob = date.fromisoformat(user_input)  # (4)!
     logfire.debug('{dob=} {age=!r}', dob=dob, age=date.today() - dob)  # (5)!
 ```