Purpose
The following PR addresses nodes' names and descriptions to make them more descriptive for beginners, PRs are organized according to the location in DynamoDS.

These corrections are for CoreNodes.Object and CoreNodes.String

NODE 220 : Object.Type
Input: obj -> object
Description Input: An object. -> Object to query type

NODE 130 : String.ToNumber
Input: str -> string

NODE 131 : String.Substring
Input: str -> string
Output: substring -> string

NODE 132 : String.Split
Input: str -> string

NODE 133 : String.PadRight
Input: str -> string
Input: newWidth -> newLength
Output: str -> string

NODE 134 : String.PadLeft
Input: str -> string
Input: newWidth -> newLength
Output: str -> string

NODE 135 : String.ChangeCase
Input: str -> string
Output: str -> string

NODE 136 : String.Center
Description: Increases the width of a string by encasing the original characters with spaces on either side. -> Increases the length of a string by encasing the original characters with spaces on either side.
Input: str -> string
Input: newWidth -> newLength
Description Input: Total length of the string after centering. -> Total length of the string after centering
Output: str -> string

NODE 137 : String.CountOccurrences
Input: str -> string
Output: count -> int

NODE 138 : String.Contains
Input: str -> string

NODE 533 : String.Length
Input: str -> string
Output: length -> int

NODE 535 : String.IndexOf
Input: str -> string
Description Input: A string to search in. -> String to search in
Output: index -> int