doc: Remove unused title ids

FOP issues warnings about them.  These aren't even used, so just
remove them.  For the ones that are actually used, we'll come up with
a different solution.

Discussion: https://www.postgresql.org/message-id/flat/e29b580e-79ab-a371-5ea4-6946e4d3af0b%402ndQuadrant.com

doc/src/sgml/ecpg.sgml

@@ -1043,7 +1043,7 @@ struct varchar_var { int len; char arr[180]; } var;
     </para>
 
     <sect4>
-     <title id="ecpg-type-timestamp-date">timestamp, date</title>
+     <title>timestamp, date</title>
 
      <para>
       Here is a pattern for handling <type>timestamp</type> variables
@@ -1208,7 +1208,7 @@ EXEC SQL END DECLARE SECTION;
     </sect4>
 
     <sect4>
-     <title id="ecpg-type-bytea">bytea</title>
+     <title>bytea</title>
 
      <para>
       The handling of the <type>bytea</type> type is similar to

doc/src/sgml/file-fdw.sgml

@@ -210,7 +210,7 @@
  </para>
 
  <example>
- <title id="csvlog-fdw">Create a Foreign Table for PostgreSQL CSV Logs</title>
+  <title>Create a Foreign Table for PostgreSQL CSV Logs</title>
 
   <para>
    One of the obvious uses for <literal>file_fdw</literal> is to make

doc/src/sgml/ref/commit_prepared.sgml

@@ -72,7 +72,7 @@ COMMIT PREPARED <replaceable class="parameter">transaction_id</replaceable>
  </refsect1>
 
  <refsect1 id="sql-commit-prepared-examples">
-  <title id="sql-commit-prepared-examples-title">Examples</title>
+  <title>Examples</title>
   <para>
    Commit the transaction identified by the transaction
    identifier <literal>foobar</literal>:

doc/src/sgml/ref/create_foreign_table.sgml

@@ -400,7 +400,7 @@ CREATE FOREIGN TABLE measurement_y2016m07
  </refsect1>
 
  <refsect1 id="sql-createforeigntable-compatibility">
-  <title id="sql-createforeigntable-compatibility-title">Compatibility</title>
+  <title>Compatibility</title>
 
   <para>
    The <command>CREATE FOREIGN TABLE</command> command largely conforms to the

doc/src/sgml/ref/create_view.sgml

@@ -284,7 +284,7 @@ CREATE VIEW vista AS SELECT text 'Hello World' AS hello;
    </para>
 
   <refsect2 id="sql-createview-updatable-views">
-   <title id="sql-createview-updatable-views-title">Updatable Views</title>
+   <title>Updatable Views</title>
 
    <indexterm zone="sql-createview-updatable-views">
     <primary>updatable views</primary>

doc/src/sgml/ref/do.sgml

@@ -101,7 +101,7 @@ DO [ LANGUAGE <replaceable class="parameter">lang_name</replaceable> ] <replacea
  </refsect1>
 
  <refsect1 id="sql-do-examples">
-  <title id="sql-do-examples-title">Examples</title>
+  <title>Examples</title>
   <para>
    Grant all privileges on all views in schema <literal>public</literal> to
    role <literal>webuser</literal>:

doc/src/sgml/ref/prepare_transaction.sgml

@@ -147,7 +147,7 @@ PREPARE TRANSACTION <replaceable class="parameter">transaction_id</replaceable>
  </refsect1>
 
  <refsect1 id="sql-prepare-transaction-examples">
-  <title id="sql-prepare-transaction-examples-title">Examples</title>
+  <title>Examples</title>
   <para>
    Prepare the current transaction for two-phase commit, using
    <literal>foobar</literal> as the transaction identifier:

doc/src/sgml/ref/rollback_prepared.sgml

@@ -72,7 +72,7 @@ ROLLBACK PREPARED <replaceable class="parameter">transaction_id</replaceable>
  </refsect1>
 
  <refsect1 id="sql-rollback-prepared-examples">
-  <title id="sql-rollback-prepared-examples-title">Examples</title>
+  <title>Examples</title>
   <para>
    Roll back the transaction identified by the transaction
    identifier <literal>foobar</literal>: