doc: Remove documentation of nonexistent information schema columns

These were probably copied in by accident.

From: Clément Prévost <prevostclement@gmail.com>

doc/src/sgml/information_schema.sgml

@@ -2897,18 +2897,6 @@ ORDER BY c.ordinal_position;
       <entry>Name of the foreign table</entry>
      </row>
 
-     <row>
-      <entry><literal>foreign_server_catalog</literal></entry>
-      <entry><type>sql_identifier</type></entry>
-      <entry>Name of the database that the foreign server is defined in (always the current database)</entry>
-     </row>
-
-     <row>
-      <entry><literal>foreign_server_name</literal></entry>
-      <entry><type>sql_identifier</type></entry>
-      <entry>Name of the foreign server</entry>
-     </row>
-
      <row>
       <entry><literal>option_name</literal></entry>
       <entry><type>sql_identifier</type></entry>