Apply batched suggestions from code review

Co-authored-by: hpkfft.com <paul@hpkfft.com>

Author: vstinner

Doc/c-api/complex.rst

@@ -199,4 +199,4 @@ the :ref:`Number Protocol <number>` API or use native complex types, like
    .. deprecated:: 3.15
 
    .. versionchanged:: 3.16
-      This function leave :c:data:`errno` unchanged on success.
+      This function leaves :c:data:`errno` unchanged on success.