ruff_python_formatter: add test for extraneous info string text (#9050)

@ofek asked [about this][ref]. I did specifically add support for it,
but neglected to add a test. This PR adds a test.

[ref]:
https://github.com/astral-sh/ruff/pull/9030#issuecomment-1846054764

crates/ruff_python_formatter/tests/snapshots/format@docstring_code_examples.py.snap

@@ -1201,6 +1201,20 @@ def markdown_over_indented():
     pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+    """
+    Do cool stuff.
+
+    ```python tab="plugin.py"
+    cool_stuff( 1 )
+    ```
+
+    Done.
+    """
+    pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -2556,6 +2570,20 @@ def markdown_over_indented():
     pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+    """
+    Do cool stuff.
+
+    ```python tab="plugin.py"
+    cool_stuff( 1 )
+    ```
+
+    Done.
+    """
+    pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -3911,6 +3939,20 @@ def markdown_over_indented():
   pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+  """
+  Do cool stuff.
+
+  ```python tab="plugin.py"
+  cool_stuff( 1 )
+  ```
+
+  Done.
+  """
+  pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -5266,6 +5308,20 @@ def markdown_over_indented():
 	pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+	"""
+	Do cool stuff.
+
+	```python tab="plugin.py"
+	cool_stuff( 1 )
+	```
+
+	Done.
+	"""
+	pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -6621,6 +6677,20 @@ def markdown_over_indented():
 	pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+	"""
+	Do cool stuff.
+
+	```python tab="plugin.py"
+	cool_stuff( 1 )
+	```
+
+	Done.
+	"""
+	pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -7971,6 +8041,20 @@ def markdown_over_indented():
     pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+    """
+    Do cool stuff.
+
+    ```python tab="plugin.py"
+    cool_stuff(1)
+    ```
+
+    Done.
+    """
+    pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -9321,6 +9405,20 @@ def markdown_over_indented():
   pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+  """
+  Do cool stuff.
+
+  ```python tab="plugin.py"
+  cool_stuff(1)
+  ```
+
+  Done.
+  """
+  pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -10671,6 +10769,20 @@ def markdown_over_indented():
 	pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+	"""
+	Do cool stuff.
+
+	```python tab="plugin.py"
+	cool_stuff(1)
+	```
+
+	Done.
+	"""
+	pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.
@@ -12021,6 +12133,20 @@ def markdown_over_indented():
 	pass
 
 
+# This tests that we can have additional text after the language specifier.
+def markdown_additional_info_string():
+	"""
+	Do cool stuff.
+
+	```python tab="plugin.py"
+	cool_stuff(1)
+	```
+
+	Done.
+	"""
+	pass
+
+
 # Tests that an unclosed block gobbles up everything remaining in the
 # docstring, even if it isn't valid Python. Since it isn't valid Python,
 # reformatting fails and the entire thing is skipped.