Update HttpService.yaml

Author: TheWandererLee

content/en-us/reference/engine/classes/HttpService.yaml

@@ -111,12 +111,14 @@ methods:
     summary: |
       Generates a UUID/GUID random string, optionally with curly braces.
     description: |
-      This method randomly creates a [universally unique identifier
+      This method randomly creates a universally unique identifier
       [UUID](https://en.wikipedia.org/wiki/Universally_unique_identifier)
       string. The sixteen octets of a UUID are represented as 32 hexadecimal
       (base 16) digits, displayed in 5 groups separated by hyphens in the form
       `8-4-4-4-12` for a total of 36 characters, for example
-      `123e4567-e89b-12d3-a456-426655440000`.
+      `123e4567-e89b-12d3-a456-426655440000`. The UUID specification used is
+      [Version 4 (Random Data)](https://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_(random))
+      Variant 1 (DCE 1.1, ISO/IEC 11578:1996).
 
       The `wrapInCurlyBraces` argument determines whether the returned string is
       wrapped in curly braces (`{}`). For instance: