docs: fix correct az servicebus message sending usage

[stijnmoreels]

Use BinaryData correctly when sending Azure Service Bus messages in the service-to-service correlation user guide.

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[codecov]

Codecov Report

Base: 86.37% // Head: 86.37% // No change to project coverage 👍

Coverage data is based on head (9aee98c) compared to base (ad80fe3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #524   +/-   ##
=======================================
  Coverage   86.37%   86.37%           
=======================================
  Files          76       76           
  Lines        3201     3201           
  Branches      220      220           
=======================================
  Hits         2765     2765           
  Misses        360      360           
  Partials       76       76           

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