doc: use imperative in COLLABORATOR_GUIDE
Instead of wording the paragraph about communicating deprecations with the ecosystem as if it were directed at the ecosystem, write it as in imperative directed at the collaborator, since that is the audience for the COLLABORATOR_GUIDE. Instead of assuring the reader that a best effort will be made, instruct the reader to make the effort to communicate with the ecosystem.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines