docs: small adjustements to recent SELECT and pg_upgrade improvements

doc/src/sgml/pgupgrade.sgml

@@ -458,10 +458,10 @@ psql --username postgres --file script.sql postgres
     <para>
      Once you are satisfied with the upgrade, you can delete the old
      cluster's data directories by running the script mentioned when
-     <command>pg_upgrade</command> completes. You can also delete the
+     <command>pg_upgrade</command> completes. (Automatic deletion is not
-     old installation directories
+     possible if you have user-defined tablespaces inside the old data
-     (e.g. <filename>bin</>, <filename>share</>).  This will not work
+     directory.)  You can also delete the old installation directories
-     if you have tablespaces inside the old data directory.
+     (e.g. <filename>bin</>, <filename>share</>).
     </para>
    </step>
 

doc/src/sgml/ref/select.sgml

@@ -1497,8 +1497,9 @@ SELECT * FROM <replaceable class="parameter">name</replaceable>
     variant in parts of complex queries. Only the <literal>WITH</>,
     <literal>UNION</>, <literal>INTERSECT</>, <literal>EXCEPT</>,
     <literal>ORDER BY</>, <literal>LIMIT</>, <literal>OFFSET</>,
-    <literal>FETCH</> and locking clauses can be used with <command>TABLE</>;
+    <literal>FETCH</> and <literal>FOR</> locking clauses can be used
-    the <literal>WHERE</> clause and any form of aggregation cannot
+    with <command>TABLE</>; the <literal>WHERE</> clause and any form of
+    aggregation cannot
     be used.
    </para>
   </refsect2>