#14804: Remove [] around optional arguments with default values
Mostly just mechanical removal of []. In some rare cases I've pulled the
default value up into the argument list.
diff --git a/Doc/library/shutil.rst b/Doc/library/shutil.rst
index 31231b6..a1e1696 100644
--- a/Doc/library/shutil.rst
+++ b/Doc/library/shutil.rst
@@ -96,7 +96,7 @@
.. versionadded:: 2.6
-.. function:: copytree(src, dst[, symlinks=False[, ignore=None]])
+.. function:: copytree(src, dst, symlinks=False, ignore=None)
Recursively copy an entire directory tree rooted at *src*. The destination
directory, named by *dst*, must not already exist; it will be created as