Update RISKS section in all tools.

bin/pt-stalk

@@ -1449,25 +1449,21 @@ collect data on demand without waiting for the trigger to occur.
 
 =head1 RISKS
 
-The following section is included to inform users about the potential risks,
-whether known or unknown, of using this tool.  The two main categories of risks
-are those created by the nature of the tool (e.g. read-only tools vs. read-write
-tools) and those created by bugs.
+Percona Toolkit is mature, proven in the real world, and well tested,
+but all database tools can pose a risk to the system and the database
+server.  Before using this tool, please:
 
-pt-stalk is a read-write tool; it collects data from the system and writes it
-into a series of files.  It should be very low-risk.  Some of the options
-can cause intrusive data collection to be performed, however, so if you enable
-any non-default options, you should read their documentation carefully.
+=over
 
-At the time of this release, we know of no bugs that could cause serious harm
-to users.
+=item * Read the tool's documentation
 
-The authoritative source for updated information is always the online issue
-tracking system.  Issues that affect this tool will be marked as such.  You can
-see a list of such issues at the following URL:
-L<http://www.percona.com/bugs/pt-stalk>.
+=item * Review the tool's known L<"BUGS">
 
-See also L<"BUGS"> for more information on filing bugs and getting help.
+=item * Test the tool on a non-production server
+
+=item * Backup your production server and verify the backups
+
+=back
 
 =head1 DESCRIPTION