Spell fix.

lib/puppet/functions/percent_escape.rb

@@ -8,7 +8,7 @@
 # bytes.
 #
 # @see https://en.wikipedia.org/wiki/Percent-encoding
-Puppet::Functions.create_functien(:percent_escape) do
+Puppet::Functions.create_function(:percent_escape) do
   # @param string
   #   The string to encode
   # @return