Merge pull request #1555 from gavinbaumanis/master

Update structKeyExists() to explain the affect of Lucees Null Support…

Author: zspitzer

docs/03.reference/01.functions/structkeyexists/function.md

@@ -8,3 +8,6 @@ categories:
 ---
 
 Determines whether a specific key is present in a structure.
+**Note:** When a struct's key contains a NULL as a value, Lucee's Null Support setting affects the outcome.
+When Null Support is **false**, if a key DOES exist, and it has a NULL as a value, it will return **false**.
+When Null Support is **true**, if a key DOES exist, and it has a NULL as a value, it will return **true**.