doc: continue line numbers in "Manual" section

[franckgaga]

This is more natural like this, the code a the bottom of the page depends on the code at the top.

[franckgaga]

It does not seems to work locally. Here's the preview : https://juliacontrol.github.io/ModelPredictiveControl.jl/previews/PR433

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (34600a0) to head (c9fe1a9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #433   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files          29       29           
  Lines        6353     6353           
=======================================
  Hits         6250     6250           
  Misses        103      103           

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[franckgaga]

So it works for online build and deployment, but not on local builds, as the preview shows:

Will merge to main after completion of the CI jobs.