Update router documentation

[lukeh990]

This PR modifies the existing docs to better reflect the example provided in:
/examples/router/src/main.rs

I tried to follow the previous documentation and ran into trait bound errors with Copy. I found the example and managed to get it working. Figured that I would propose changing the docs to reflect that example better.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.42%. Comparing base (1f64418) to head (f1184af).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #788   +/-   ##
=======================================
  Coverage   71.42%   71.42%           
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  Files          45       45           
  Lines        6659     6659           
=======================================
  Hits         4756     4756           
  Misses       1903     1903           

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[lukechu10]

Sorry for taking so long, I thought I had already reviewed this. Just made a small suggestion to reword the example section.

[lukeh990]

@lukechu10 Thanks for getting back to me. I honestly sort of forgot I made this PR. And yeah, I like that new wording better.