It looks like the docs weren't updated in 6f6b99d13 for v11.
The docs also seem to omit "FOR VALUES" literal.
And don't define partition_bound_spec (which I didn't fix here).
diff --git a/doc/src/sgml/ref/create_foreign_table.sgml b/doc/src/sgml/ref/create_foreign_table.sgml
index b374d8645db..1f1c4a52a2a 100644
--- a/doc/src/sgml/ref/create_foreign_table.sgml
+++ b/doc/src/sgml/ref/create_foreign_table.sgml
@@ -35,7 +35,8 @@ CREATE FOREIGN TABLE [ IF NOT EXISTS ] <replaceable class="parameter">table_name
{ <replaceable class="parameter">column_name</replaceable> [ WITH OPTIONS ] [ <replaceable
class="parameter">column_constraint</replaceable>[ ... ] ]
| <replaceable>table_constraint</replaceable> }
[, ... ]
-) ] <replaceable class="parameter">partition_bound_spec</replaceable>
+) ]
+ { FOR VALUES <replaceable class="parameter">partition_bound_spec</replaceable> | DEFAULT }
SERVER <replaceable class="parameter">server_name</replaceable>
[ OPTIONS ( <replaceable class="parameter">option</replaceable> '<replaceable class="parameter">value</replaceable>'
[,... ] ) ]
