doc: rephrase exit code preamble

Previously it kind of implied more than one code can be emitted.

doc/repmgr-cluster-crosscheck.sgml

@@ -42,7 +42,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr cluster crosscheck</command>:
+      One of the following exit codes will be emitted by <command>repmgr cluster crosscheck</command>:
     </para>
     <variablelist>
 

doc/repmgr-cluster-matrix.sgml

@@ -102,7 +102,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr cluster matrix</command>:
+      One of the following exit codes will be emitted by <command>repmgr cluster matrix</command>:
     </para>
     <variablelist>
 

doc/repmgr-cluster-show.sgml

@@ -155,7 +155,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr cluster show</command>:
+      One of the following exit codes will be emitted by <command>repmgr cluster show</command>:
     </para>
     <variablelist>
 

doc/repmgr-daemon-pause.sgml

@@ -79,7 +79,7 @@ NOTICE: node 3 (node3) paused</programlisting>
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr daemon unpause</command>:
+      One of the following exit codes will be emitted by <command>repmgr daemon unpause</command>:
     </para>
     <variablelist>
 

doc/repmgr-daemon-start.sgml

@@ -103,7 +103,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr daemon start</command>:
+      One of the following exit codes will be emitted by <command>repmgr daemon start</command>:
     </para>
     <variablelist>
 

doc/repmgr-daemon-stop.sgml

@@ -110,7 +110,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr daemon stop</command>:
+      One of the following exit codes will be emitted by <command>repmgr daemon stop</command>:
     </para>
     <variablelist>
 

doc/repmgr-daemon-unpause.sgml

@@ -74,7 +74,7 @@ NOTICE: node 3 (node3) unpaused</programlisting>
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr daemon unpause</command>:
+      One of the following exit codes will be emitted by <command>repmgr daemon unpause</command>:
     </para>
     <variablelist>
 

doc/repmgr-node-check.sgml

@@ -162,7 +162,7 @@
 
 
     <para>
-      Following exit codes can be emitted by <command>repmgr status check</command>
+      One of the following exit codes will be emitted by <command>repmgr status check</command>
       if no individual check was specified.
     </para>
 

doc/repmgr-node-rejoin.sgml

@@ -134,7 +134,7 @@
 		   60 seconds).
 		 </simpara>
          <simpara>
-           Note that<literal>standby_reconnect_timeout</literal> must be
+           Note that <literal>standby_reconnect_timeout</literal> must be
            set to a value equal to or greater than
            <literal>node_rejoin_timeout</literal>.
          </simpara>
@@ -153,7 +153,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr node rejoin</command>:
+      One of the following exit codes will be emitted by <command>repmgr node rejoin</command>:
     </para>
 
     <variablelist>

doc/repmgr-node-service.sgml

@@ -84,7 +84,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr node service</command>:
+      One of the following exit codes will be emitted by <command>repmgr node service</command>:
     </para>
     <variablelist>
 

doc/repmgr-node-status.sgml

@@ -55,7 +55,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr node status</command>:
+      One of the following exit codes will be emitted by <command>repmgr node status</command>:
     </para>
     <variablelist>
 

doc/repmgr-standby-follow.sgml

@@ -149,7 +149,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr standby follow</command>:
+      One of the following exit codes will be emitted by <command>repmgr standby follow</command>:
     </para>
     <variablelist>
 

doc/repmgr-standby-switchover.sgml

@@ -162,7 +162,7 @@
     <title>Configuration file settings</title>
 
     <para>
-     Note that following parameters in <filename>repmgr.conf</filename> are relevant to the
+     The following parameters in <filename>repmgr.conf</filename> are relevant to the
      switchover operation:
     </para>
 
@@ -310,7 +310,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <command>repmgr standby switchover</command>:
+      One of the following exit codes will be emitted by <command>repmgr standby switchover</command>:
     </para>
     <variablelist>