diff --git a/doc/src/sgml/ref/drop_database.sgml b/doc/src/sgml/ref/drop_database.sgml
index cef1b90421..ff01450ba7 100644
--- a/doc/src/sgml/ref/drop_database.sgml
+++ b/doc/src/sgml/ref/drop_database.sgml
@@ -21,7 +21,7 @@ PostgreSQL documentation
 
  <refsynopsisdiv>
 <synopsis>
-DROP DATABASE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [ [ WITH ] ( <replaceable class="parameter">option</replaceable> [, ...] ) ] 
+DROP DATABASE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [ [ WITH ] ( <replaceable class="parameter">option</replaceable> [, ...] ) ]
 
 <phrase>where <replaceable class="parameter">option</replaceable> can be:</phrase>
 
@@ -81,7 +81,7 @@ DROP DATABASE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [
      </para>
      <para>
       This will fail if the current user has no permissions to terminate other
-      connections. Required permissions are the same as with 
+      connections. Required permissions are the same as with
       <literal>pg_terminate_backend</literal>, described in
       <xref linkend="functions-admin-signal"/>.  This will also fail if we
       are not able to terminate connections.
diff --git a/doc/src/sgml/ref/pg_checksums.sgml b/doc/src/sgml/ref/pg_checksums.sgml
index 6baf9deaae..8e7807f86b 100644
--- a/doc/src/sgml/ref/pg_checksums.sgml
+++ b/doc/src/sgml/ref/pg_checksums.sgml
@@ -106,7 +106,7 @@ PostgreSQL documentation
       <listitem>
        <para>
         Only validate checksums in the relation with filenode
-        <replaceable>filenode</replaceable>. 
+        <replaceable>filenode</replaceable>.
        </para>
       </listitem>
      </varlistentry>
diff --git a/doc/src/sgml/ref/pg_receivewal.sgml b/doc/src/sgml/ref/pg_receivewal.sgml
index 110d571714..cad4689ae6 100644
--- a/doc/src/sgml/ref/pg_receivewal.sgml
+++ b/doc/src/sgml/ref/pg_receivewal.sgml
@@ -66,7 +66,7 @@ PostgreSQL documentation
   <para>
    The write-ahead log is streamed over a regular
    <productname>PostgreSQL</productname> connection and uses the replication
-   protocol. The connection must be made with a user having 
+   protocol. The connection must be made with a user having
    <literal>REPLICATION</literal> permissions (see
    <xref linkend="role-attributes"/>) or a superuser, and
    <filename>pg_hba.conf</filename> must permit the replication connection.
diff --git a/doc/src/sgml/ref/pg_verifybackup.sgml b/doc/src/sgml/ref/pg_verifybackup.sgml
index 4f75863a8c..c2b7567c4c 100644
--- a/doc/src/sgml/ref/pg_verifybackup.sgml
+++ b/doc/src/sgml/ref/pg_verifybackup.sgml
@@ -73,7 +73,7 @@ PostgreSQL documentation
    files won't be listed in the backup manifest. Only files are checked;
    the presence or absence of directories is not verified, except
    indirectly: if a directory is missing, any files it should have contained
-   will necessarily also be missing. 
+   will necessarily also be missing.
   </para>
 
   <para>
diff --git a/doc/src/sgml/release-13.sgml b/doc/src/sgml/release-13.sgml
index 5c4b5fbf54..8c0dc5a2a8 100644
--- a/doc/src/sgml/release-13.sgml
+++ b/doc/src/sgml/release-13.sgml
@@ -210,7 +210,7 @@ Author: Fujii Masao <fujii@postgresql.org>
     <listitem>
 <!--
 Author: Tom Lane <tgl@sss.pgh.pa.us>
-2020-03-05 [84eca14bc] Remove ancient hacks to ignore certain opclass names in 
+2020-03-05 [84eca14bc] Remove ancient hacks to ignore certain opclass names in
 -->
 
      <para>
@@ -495,7 +495,7 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
       <listitem>
 <!--
 Author: Tom Lane <tgl@sss.pgh.pa.us>
-2020-04-01 [a80818605] Improve selectivity estimation for assorted match-style 
+2020-04-01 [a80818605] Improve selectivity estimation for assorted match-style
 -->
 
        <para>
@@ -545,7 +545,7 @@ Author: Tomas Vondra <tomas.vondra@postgresql.org>
 Author: Tomas Vondra <tomas.vondra@postgresql.org>
 2020-03-14 [e83daa7e3] Use multi-variate MCV lists to estimate ScalarArrayOpExp
 Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2020-03-18 [ccaa3569f] Recognize some OR clauses as compatible with functional 
+2020-03-18 [ccaa3569f] Recognize some OR clauses as compatible with functional
 -->
 
        <para>
@@ -1638,7 +1638,7 @@ Author: Thomas Munro <tmunro@postgresql.org>
      <listitem>
 <!--
 Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-10-28 [8b7a0f1d1] Allow extracting fields from a ROW() expression in more 
+2019-10-28 [8b7a0f1d1] Allow extracting fields from a ROW() expression in more
 -->
 
       <para>
@@ -2308,7 +2308,7 @@ Author: Robert Haas <rhaas@postgresql.org>
      <listitem>
 <!--
 Author: Author: Fujii Masao <fujii@postgresql.org>
-2020-03-19 [fab13dc50] Make pg_basebackup ask the server to estimate the total 
+2020-03-19 [fab13dc50] Make pg_basebackup ask the server to estimate the total
 -->
 
       <para>