bpo-30754: Document textwrap.dedent blank line behavior. (GH-14469)
* Added documentation for textwrap.dedent behavior.
* Remove an obsolete note about pre-2.5 behavior from the docstring.
diff --git a/Doc/library/textwrap.rst b/Doc/library/textwrap.rst
index d254466..0f11ef4 100644
--- a/Doc/library/textwrap.rst
+++ b/Doc/library/textwrap.rst
@@ -77,6 +77,9 @@
equal: the lines ``" hello"`` and ``"\thello"`` are considered to have no
common leading whitespace.
+ Lines containing only whitespace are ignored in the input and normalized to a
+ single newline character in the output.
+
For example::
def test():