chore(deps): use patched git sha version of e-c-addon-docs

Author: jamescdavis

package.json

@@ -84,7 +84,7 @@
     "commitlint-azure-pipelines-cli": "1.0.2",
     "conventional-changelog-cli": "2.0.28",
     "ember-cli": "3.14.0",
-    "ember-cli-addon-docs": "0.6.15",
+    "ember-cli-addon-docs": "ember-learn/ember-cli-addon-docs#4f5bfd11",
     "ember-cli-addon-docs-esdoc": "0.2.3",
     "ember-cli-app-version": "3.2.0",
     "ember-cli-babel": "7.13.0",