docs: fix text by adding/removing parentheses

Reported-by: Daisuke Higuchi

Author: Daisuke Higuchi, Erik Wienhold

Reviewed-by: Erik Wienhold

Discussion: https://postgr.es/m/CAEVT6c9FRQcFCzQ8AO=QoeQNA-w6RhTkfOUHzY6N2xD5YnBxhg@mail.gmail.com

Backpatch-through: master

doc/src/sgml/client-auth.sgml

@@ -305,7 +305,7 @@ include_dir         <replaceable>directory</replaceable>
        Specifies which database user name(s) this record
        matches. The value <literal>all</literal> specifies that it
        matches all users.  Otherwise, this is either the name of a specific
-       database user, a regular expression (when starting with a slash
+       database user, a regular expression when starting with a slash
        (<literal>/</literal>), or a group name preceded by <literal>+</literal>.
        (Recall that there is no real distinction between users and groups
        in <productname>PostgreSQL</productname>; a <literal>+</literal> mark really means

doc/src/sgml/ltree.sgml

@@ -645,7 +645,7 @@ Europe & Russia*@ & !Transportation
      <literal>siglen</literal> determines the
      signature length in bytes.  The default signature length is 8 bytes.
      The length must be a positive multiple of <type>int</type> alignment
-     (4 bytes on most machines)) up to 2024.  Longer
+     (4 bytes on most machines) up to 2024.  Longer
      signatures lead to a more precise search (scanning a smaller fraction of the index and
      fewer heap pages), at the cost of a larger index.
     </para>

doc/src/sgml/trigger.sgml

@@ -823,7 +823,7 @@ typedef struct Trigger
         <varname>attnum</varname> (1-based) is a member of this bitmap set,
         call <literal>bms_is_member(attnum -
         FirstLowInvalidHeapAttributeNumber,
-        trigdata->tg_updatedcols))</literal>.
+        trigdata->tg_updatedcols)</literal>.
        </para>
 
        <para>