Supply missing word in new datetime docs, aggravated by copy-paste-edit.
diff --git a/Doc/api/concrete.tex b/Doc/api/concrete.tex
index 82990b6..023b8f2 100644
--- a/Doc/api/concrete.tex
+++ b/Doc/api/concrete.tex
@@ -2756,7 +2756,7 @@
\versionadded{2.4}
\end{cfuncdesc}
-Macros to extract fields from date objects. The argument must an
+Macros to extract fields from date objects. The argument must be an
instance of \cdata{PyDateTime_Date}, including subclasses (such as
\cdata{PyDateTime_DateTime}). The argument must not be \NULL{}, and
the type is not checked:
@@ -2776,7 +2776,7 @@
\versionadded{2.4}
\end{cfuncdesc}
-Macros to extract fields from datetime objects. The argument must an
+Macros to extract fields from datetime objects. The argument must be an
instance of \cdata{PyDateTime_DateTime}, including subclasses.
The argument must not be \NULL{}, and the type is not checked:
@@ -2800,7 +2800,7 @@
\versionadded{2.4}
\end{cfuncdesc}
-Macros to extract fields from time objects. The argument must an
+Macros to extract fields from time objects. The argument must be an
instance of \cdata{PyDateTime_Time}, including subclasses.
The argument must not be \NULL{}, and the type is not checked: