Docs gss rename (#2761)

* Pivotal GSS name change to Pivotal Support

* Change Greenplum Customer Support reference to a Warning, as in the user doc

gpMgmt/doc/gpconfig_help

@@ -153,8 +153,8 @@ Overrides the system validation checks of gpconfig and allows you
 to operate on any server configuration parameter, including hidden 
 parameters and restricted parameters that cannot be changed by 
 gpconfig. When used with the -l option (list), it shows the list 
-of restricted parameters. This option should only be used to set 
-parameters when directed by Greenplum Customer Support.
+of restricted parameters. Warning: Use extreme caution when setting
+configuration parameters with this option.
 
 
 --verbose 

gpdb-doc/dita/ref_guide/config_params/guc-list.xml

@@ -9145,8 +9145,7 @@
       <p>If Greenplum Database detects a corruption in the free TID list, the free TID list is
         rebuilt, a warning is logged, and a warning is returned by queries for which the check
         failed. Greenplum Database attempts to execute the queries. </p>
-      <note otherprops="pivotal">If a warning is returned, please contact Pivotal Global Support
-        Services.</note>
+      <note otherprops="pivotal">If a warning is returned, please contact Pivotal Support.</note>
       <table id="table_fkc_4pb_1w">
         <tgroup cols="3">
           <colspec colnum="1" colname="col1" colwidth="1*"/>

gpdb-doc/dita/ref_guide/system_catalogs/gp_configuration_history.xml

@@ -10,8 +10,8 @@
         <codeph>gpcheck</codeph>, <codeph>gprecoverseg</codeph>, and <codeph>gpinitsystem</codeph>.
       For example, when you add a new segment and mirror segment to the system, records for these
       events are logged to <codeph>gp_configuration_history</codeph>.</p>
-    <p>The event descriptions stored in this table may be helpful for troubleshooting serious system
-      issues in collaboration with Greenplum support technicians.</p>
+    <p otherprops="pivotal">The event descriptions stored in this table may be helpful for troubleshooting serious system
+      issues in collaboration with Pivotal Support technicians.</p>
     <p>This table is populated only on the master. This table is defined in the
         <codeph>pg_global</codeph> tablespace, meaning it is globally shared across all databases in
       the system.</p>