Docs: Remove author emails from stdlib functions

Author email addresses were included in the doc strings for some (but not all)
stdlib functions. This commit removes them in the interest of consistency.

lib/puppet/parser/functions/validate_bool.rb

@@ -17,9 +17,6 @@ module Puppet::Parser::Functions
         validate_bool("true")
         validate_bool($some_array)
 
-    * Jeff McCune <jeff@puppetlabs.com>
-    * Dan Bode <dan@puppetlabs.com>
-
     ENDHEREDOC
 
     unless args.length > 0 then

lib/puppet/parser/functions/validate_hash.rb

@@ -16,8 +16,6 @@ module Puppet::Parser::Functions
         $undefined = undef
         validate_hash($undefined)
 
-    * Jeff McCune <jeff@puppetlabs.com>
-
     ENDHEREDOC
 
     unless args.length > 0 then

lib/puppet/parser/functions/validate_re.rb

@@ -17,8 +17,6 @@ module Puppet::Parser::Functions
 
         validate_re('one', [ '^two', '^three' ])
 
-    Jeff McCune <jeff@puppetlabs.com>
-
     ENDHEREDOC
     if args.length != 2 then
       raise Puppet::ParseError, ("validate_re(): wrong number of arguments (#{args.length}; must be 2)")