fix: Update documentation for MultichainRouter

[Mrtenz]

This updates the documentation for MultichainRouter to clarify some things.

---

Note

Low Risk
Documentation-only updates in MultichainRouter.ts with no runtime behavior changes.

Overview
Clarifies MultichainRouter JSDoc to better describe scope-specific connectedAddresses, fixes minor wording/formatting (e.g., case-sensitive/case-insensitive hyphenation), and removes a small typo in the request-routing documentation.

^{Written by Cursor Bugbot for commit 1b5e070. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.40%. Comparing base (5ab30ee) to head (1b5e070).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3827   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files         430      430           
  Lines       12448    12448           
  Branches     1933     1933           
=======================================
  Hits        12249    12249           
  Misses        199      199           

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