doc: Re-order Table 28.12 "Wait Events of type LWLock"

The overall order is alphabetic, but there were a few additions that
didn't observe this.

Author: Peter Smith <peter.b.smith@fujitsu.com>
Reviewed-by: David G. Johnston <david.g.johnston@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAHut+Pv8Oa7v06hJb3+HzCtM2u-3oHWMdvXVHhvi7ofB83pNbg@mail.gmail.com

Author: petere

doc/src/sgml/monitoring.sgml

@@ -2071,6 +2071,18 @@ postgres   27093  0.0  0.0  30096  2752 ?        Ss   11:34   0:00 postgres: ser
       <entry>Waiting to access the list of predicate locks held by the current
        serializable transaction during a parallel query.</entry>
      </row>
+     <row>
+      <entry><literal>PgStatsData</literal></entry>
+      <entry>Waiting for shared memory stats data access</entry>
+     </row>
+     <row>
+      <entry><literal>PgStatsDSA</literal></entry>
+      <entry>Waiting for stats dynamic shared memory allocator access</entry>
+     </row>
+     <row>
+      <entry><literal>PgStatsHash</literal></entry>
+      <entry>Waiting for stats shared memory hash table access</entry>
+     </row>
      <row>
       <entry><literal>PredicateLockManager</literal></entry>
       <entry>Waiting to access predicate lock information used by
@@ -2129,18 +2141,6 @@ postgres   27093  0.0  0.0  30096  2752 ?        Ss   11:34   0:00 postgres: ser
       <entry>Waiting to access the list of predicate locks held by
        serializable transactions.</entry>
      </row>
-     <row>
-      <entry><literal>PgStatsDSA</literal></entry>
-      <entry>Waiting for stats dynamic shared memory allocator access</entry>
-     </row>
-     <row>
-      <entry><literal>PgStatsHash</literal></entry>
-      <entry>Waiting for stats shared memory hash table access</entry>
-     </row>
-     <row>
-      <entry><literal>PgStatsData</literal></entry>
-      <entry>Waiting for shared memory stats data access</entry>
-     </row>
      <row>
       <entry><literal>SerializableXactHash</literal></entry>
       <entry>Waiting to read or update information about serializable