Doc: remove bogus <indexterm> items.
Copy-and-pasteo in evidently.  The 9.6 docs toolchain
whined about duplicate index entries, though our modern toolchain
doesn't.  In any case, these GUCs surely are not about the
default settings of these values.
@@ -7801,7 +7801,6 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
<term><varname>transaction_read_only</varname> (<type>boolean</type>)
<indexterm>
<primary>read-only transaction</primary>
- <secondary>setting default</secondary>
</indexterm>
<indexterm>
<primary><varname>transaction_read_only</varname> configuration parameter</primary>
@@ -7822,7 +7821,6 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
<term><varname>transaction_deferrable</varname> (<type>boolean</type>)
<indexterm>
<primary>deferrable transaction</primary>
- <secondary>setting default</secondary>
</indexterm>
<indexterm>
<primary><varname>transaction_deferrable</varname> configuration parameter</primary>
