Rivet_i: docs update

Document latest available versions.

added Generators main labels

This merge request affects 1 package:

• Generators/Rivet_i

This merge request affects 1 file:

• Generators/Rivet_i/README.md

added review-pending-level-1 label

The system determined that the changset affects text files and cancelled CI integration tests

CI Result SUCCESS (hash 7292ef38)

	Athena	AthGeneration
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 5883] (remote access info)

Straightforward change - approving

L1 shifter

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 46cdbbfa