chore(deps): bump js-yaml from 3.13.1 to 3.15.0 in /docs

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.13.1 to 3.15.0.
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.13.1...3.15.0)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 3.15.0
  dependency-type: indirect
...

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

Author: dependabot[bot]

docs/yarn.lock

@@ -6408,9 +6408,9 @@ jest@24.9.0:
   integrity sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==
 
 js-yaml@^3.13.1:
-  version "3.13.1"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.13.1.tgz#aff151b30bfdfa8e49e05da22e7415e9dfa37847"
-  integrity sha512-YfbcO7jXDdyj0DGxYVSlSeQNHbD7XPWvrVWeVUujrQEoZzWJIRrCPoyk6kL6IAjAG2IolMK4T0hNUe0HOUs5Jw==
+  version "3.15.0"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.15.0.tgz#586e5214eafe3e893756a41e979b50d89d3e4a67"
+  integrity sha512-ttBQIIQPDeLjpPOohtUdXuXUVoA2uIB6fEH9HyJ7234s5mBJ5wTx20njxplLZQgLaOfpmPQA7X2t5AX6tIPbog==
   dependencies:
     argparse "^1.0.7"
     esprima "^4.0.0"