Fix build instructions

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

With all the changes made in the last few weeks, some necessary changes to the build instructions fell through the cracks when getting reviews. This PR fixes them.

Fixes # (issue)

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Added/removed dependencies
• Required documentation updates

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.05%. Comparing base (5860e95) to head (a9dc64f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #408   +/-   ##
=======================================
  Coverage   82.05%   82.05%           
=======================================
  Files          21       21           
  Lines         858      858           
  Branches       89       89           
=======================================
  Hits          704      704           
  Misses        154      154           

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[vgvassilev]

LGTM!