Exhibit good form in C code: always provide docstrings in method tables, and

always fill in all slots of table entries.
Fixed a few minor markup errors.

Doc/ext/embedding.tex

@@ -231,9 +231,10 @@ emb_numargs(PyObject *self, PyObject *args)
     return Py_BuildValue("i", numargs);
 }
 
-static PyMethodDef EmbMethods[]={
-    {"numargs", emb_numargs, METH_VARARGS},
-    {NULL,      NULL}
+static PyMethodDef EmbMethods[] = {
+    {"numargs", emb_numargs, METH_VARARGS,
+     "Return the number of arguments received by the process."},
+    {NULL, NULL, 0, NULL}
 };
 \end{verbatim}