bitReverse... functions incorrectly documented as "Since: base-4.12.0.0".

Summary

Starting with base-4.14.0.0, the Haddocks of base mention the bitReverse... functions in Data.Word and in GHC.Word, claiming "Since: base-4.12.0.0".

However, it appears these functions were new with base-4.14.0.0. They do not appear in the source code for either GHC 8.8.4 or GHC 8.6.5, and they do not appear in base documentation prior to base-4.14.0.0.

Proposed improvements or changes

The Haddocks for the bitReverse... functions in Data.Word and in GHC.Word should state: "Since: base-4.14.0.0".

Environment

GHC 8.10+ with preprocessor conditionals to support GHC 8.8.4-

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