doc: remove recommendation to use node-eps
https://github.com/nodejs/node-eps has been archived and new proposals can no longer be opened there. Remove the corresponding recommendation to use it.
Refs: https://github.com/nodejs/TSC/issues/335
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines