doc: clarify --pending-deprecation effects on Buffer() usage
Alternative to https://github.com/nodejs/node/pull/29725
Refs: https://github.com/nodejs/node/pull/29725#issuecomment-535723152
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines