CAT-1147 comments added

Author: Dinesh Gujar

lib/puppet/functions/mysql/innobackupex_args.rb

@@ -1,6 +1,19 @@
 # frozen_string_literal: true
 
+# @summary this function populates and returns the string of arguments which later gets injected in template.
+# arguments that return string holds is conditional and decided by the the input given to function.
+
 Puppet::Functions.create_function(:'mysql::innobackupex_args') do
+  # @param args
+  #   String backupuser
+  #   Boolean backupcompress
+  #   String backuppassword_unsensitive
+  #   Array backupdatabases
+  #   Array optional_args
+  #
+  # @return String
+  #   Generated on the basis of provided values.
+  #
   dispatch :innobackupex_args do
     required_param 'Optional[String]', :backupuser
     required_param 'Boolean', :backupcompress