Added doc strings for first five functions

lib/puppet/parser/functions/abs.rb

@@ -4,6 +4,8 @@
 
 module Puppet::Parser::Functions
   newfunction(:abs, :type => :rvalue, :doc => <<-EOS
+    Returns the absolute value of a number, for example -34.56 becomes 
+    34.56. Takes a single integer and float value as an argument.
     EOS
   ) do |arguments|
 

lib/puppet/parser/functions/bool2num.rb

@@ -4,6 +4,10 @@
 
 module Puppet::Parser::Functions
   newfunction(:bool2num, :type => :rvalue, :doc => <<-EOS
+    Converts a boolean to a number. Converts the values:
+      false, f, 0, n, and no to 0
+      true, t, 1, y, and yes to 1
+    Requires a single boolean or string as an input.
     EOS
   ) do |arguments|
 

lib/puppet/parser/functions/capitalize.rb

@@ -4,6 +4,8 @@
 
 module Puppet::Parser::Functions
   newfunction(:capitalize, :type => :rvalue, :doc => <<-EOS
+    Capitalizes the first letter of a string or array of strings.
+    Requires either a single string or an array as an input.
     EOS
   ) do |arguments|
 

lib/puppet/parser/functions/chomp.rb

@@ -3,7 +3,10 @@
 #
 
 module Puppet::Parser::Functions
-  newfunction(:chomp, :type => :rvalue, :doc => <<-EOS
+  newfunction(:chomp, :type => :rvalue, :doc => <<-'EOS'
+    Removes the record separator from the end of a string or an array of 
+    strings, for example `hello\n` becomes `hello`.
+    Requires a single string or array as an input.
     EOS
   ) do |arguments|
 

lib/puppet/parser/functions/chop.rb

@@ -3,7 +3,12 @@
 #
 
 module Puppet::Parser::Functions
-  newfunction(:chop, :type => :rvalue, :doc => <<-EOS
+  newfunction(:chop, :type => :rvalue, :doc => <<-'EOS'
+    Returns a new string with the last character removed. If the string ends 
+    with `\r\n`, both characters are removed. Applying chop to an empty 
+    string returns an empty string. If you wish to merely remove record 
+    separators then you should use the `chomp` function.
+    Requires a string or array of strings as input.
     EOS
   ) do |arguments|