Update documentation for uint64 handling in logs (#14039)

ref convos in getsentry/relay#4689

The `attributes` section in `develop-docs/sdk/telemetry/logs.mdx` was
updated to clarify handling of 64-bit unsigned integers.

* Initially, the text "In the future we will support 64-bit unsigned
integers." was replaced with "For 64-bit unsigned integers, use the
`string` type to avoid overflow issues."
* This change was made to provide immediate guidance based on internal
discussions, recommending `string` conversion to prevent data loss or
precision issues.
* Subsequently, the documentation was further refined to include both
the current guidance and the future roadmap.
* The line now reads: "For 64-bit unsigned integers, use the `string`
type to avoid overflow issues. In the future we will support 64-bit
unsigned integers."
* This ensures SDK developers and third-party integration authors have
clear instructions for current implementation while also being aware of
planned native support.

---------

Co-authored-by: Cursor Agent <[email protected]>

Author: AbhiPrasad

develop-docs/sdk/telemetry/logs.mdx

@@ -89,7 +89,7 @@ It consists of the following fields:
 
 : **Object, optional**. A dictionary of key-value pairs of arbitrary data attached to the log. Attributes must also declare the type of the value. The following types are supported: `string`, `boolean`, `integer`, `double`. In the future arrays will be supported (`string[]`, `boolean[]`, `integer[]`, `double[]`).
 
-Integers should be a 64-bit signed integer, while doubles should be a 64-bit floating point number. In the future we will support 64-bit unsigned integers.
+Integers should be a 64-bit signed integer, while doubles should be a 64-bit floating point number. For 64-bit unsigned integers, use the `string` type to avoid overflow issues. In the future we will support 64-bit unsigned integers.
 
 Example: