Add sed and grep to the list of prerequisites

[stefaniuk]

Description

Add sed and grep GNU toolchain commands to the list of prerequisites.

Context

While setting up workstations with a new team, some scripts failed and it wasn't immediately apparent that the version of the sed command had to be GNU compliant.

Type of changes

• [x] Refactoring (non-breaking change)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would change existing functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)

Checklist

• [x] I am familiar with the contributing guidelines
• [x] I have followed the code style of the project
• [ ] I have added tests to cover my changes
• [x] I have updated the documentation accordingly
• [ ] This PR is a result of pair or mob programming

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Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

• [x] I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[regularfry]

I'm not sure about that second commit. Ordinarily I'd say that tool names should be backticked, and the accept list should be used for actual words that vale doesn't know. Have we got something going on here where that doesn't work?