docs: update migration docs urls to include new /migration path (closes #571)

[ConorSheehan1]

Related Issues

closes #571

[codecov]

Codecov Report

Merging #572 (2a70288) into master (2a94fb0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #572   +/-   ##
=======================================
  Coverage   87.67%   87.67%           
=======================================
  Files          14       14           
  Lines        1752     1752           
  Branches      432      432           
=======================================
  Hits         1536     1536           
  Misses        201      201           
  Partials       15       15           

Impacted Files	Coverage Δ
...ages/mongodb-memory-server-core/src/util/errors.ts	96.29% <ø> (ø)

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[hasezoey]

thanks, forgot to change this when moving the files

[github-actions]

🎉 This PR is included in version 8.0.1 🎉

The release is available on:

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• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
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• GitHub release

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[hasezoey]

Note: this fix is also included ("backported") into 7.6.2