Improve UUID definition details

Extracted the most relevant information from Wikipedia and UUIDTools to be placed directly in this documentation.

Author: TheWandererLee

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

@@ -109,16 +109,34 @@ properties:
 methods:
   - name: HttpService:GenerateGUID
     summary: |
-      Generates a UUID/GUID random string, optionally with curly braces.
+      Generates a /GUID random string, optionally with curly braces.
     description: |
-      This method randomly creates a universally unique identifier
-      ([UUID](https://en.wikipedia.org/wiki/Universally_unique_identifier))
+      This method generates a **random 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`. 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).
+      Version 4 (Random Data), Variant 1 (DCE 1.1, ISO/IEC 11578:1996).
+      (See
+      [UUIDTools](https://www.uuidtools.com/uuid-versions-explained#version-4)
+      or
+      [Wikipedia](https://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_(random))
+      for more info.)
+
+      Version 4 UUIDs are the most commonly used due to their simplicity, as
+      they are entirely randomly generated.
+      This version does not have certain features that other UUID
+      versions have, such as encoded timestamps, MAC addresses, or provide
+      time-based sorting like [UUIDv7](https://uuid7.com/) or
+      [ULID](https://github.com/ulid/spec)).
+
+      There are over 5.3 x 10<sup>36</sup> unique v4 UUIDs. The
+      probability to find a duplicate within 103 trillion version-4 UUIDs is one
+      in a billion. The number of random version-4 UUIDs which need to be
+      generated in order to have a 50% probability of at least one collision is
+      2.71 quintillion.
+      ([Source: Wikipedia](https://en.wikipedia.org/wiki/Universally_unique_identifier#Collisions))
 
       The `wrapInCurlyBraces` argument determines whether the returned string is
       wrapped in curly braces (`{}`). For instance: