Fix typo: filters => filter

diff --git a/doc/filters/length.rst b/doc/filters/length.rst
index 5e0f73a..1f783b3 100644 (file)
--- a/doc/filters/length.rst
+++ b/doc/filters/length.rst
@@ -1,7 +1,7 @@
 ``length``
 ==========
 
-The ``length`` filters returns the number of items of a sequence or mapping, or
+The ``length`` filter returns the number of items of a sequence or mapping, or
 the length of a string:
 
 .. code-block:: jinja