doc: revise Collaborator Nominations introduction
In a continued effort to make our GOVERNANCE.md easier to read and understand:
Revise the introductory paragraphs for Collaborator Nominations in GOVERNANCE.md. This change splits long and unnecessarily complex sentences into multiple simple statements.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines