Fixing minor typo in basics.rst (#1984)

diff --git a/docs/basics.rst b/docs/basics.rst
index 447250e..7bf4d42 100644
--- a/docs/basics.rst
+++ b/docs/basics.rst
@@ -164,7 +164,7 @@
 Keyword arguments
 =================
 
-With a simple modification code, it is possible to inform Python about the
+With a simple code modification, it is possible to inform Python about the
 names of the arguments ("i" and "j" in this case).
 
 .. code-block:: cpp