Fix errors found by "make suspicious".
diff --git a/Doc/extending/extending.rst b/Doc/extending/extending.rst
index dcef3f8..1d40649 100644
--- a/Doc/extending/extending.rst
+++ b/Doc/extending/extending.rst
@@ -162,7 +162,7 @@
for a variety of reasons.)
To ignore an exception set by a function call that failed, the exception
-c:ondition must be cleared explicitly by calling :c:func:`PyErr_Clear`. The only
+condition must be cleared explicitly by calling :c:func:`PyErr_Clear`. The only
time C code should call :c:func:`PyErr_Clear` is if it doesn't want to pass the
error on to the interpreter but wants to handle it completely by itself
(possibly by trying something else, or pretending nothing went wrong).