Bump hoek from 4.2.0 to 4.2.1 in /docs

Bumps [hoek](https://github.com/hapijs/hoek) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/hapijs/hoek/releases)
- [Commits](hapijs/hoek@v4.2.0...v4.2.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/yarn.lock

@@ -2539,8 +2539,9 @@ hmac-drbg@^1.0.0:
     minimalistic-crypto-utils "^1.0.1"
 
 hoek@4.x.x:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/hoek/-/hoek-4.2.0.tgz#72d9d0754f7fe25ca2d01ad8f8f9a9449a89526d"
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/hoek/-/hoek-4.2.1.tgz#9634502aa12c445dd5a7c5734b572bb8738aacbb"
+  integrity sha512-QLg82fGkfnJ/4iy1xZ81/9SIJiq1NGFUMGs6ParyjBZr6jW2Ufj/snDqTHixNlHdPNwN2RLVD0Pi3igeK9+JfA==
 
 hoist-non-react-statics@1.x.x, hoist-non-react-statics@^1.2.0:
   version "1.2.0"