Refactored ArrayGet instruction and added documentation for the instruction.

docs/array_get.md

@@ -0,0 +1,39 @@
+# array_get
+
+Get an item from an array using "dot" notation.
+
+## Parameters
+
+* array (`array`, `instruction`) - The array to get the value from.
+* key (`string`, `instruction`) - The key to get the value for.
+
+## Return
+
+(mixed) - The value of the key or throws an exception if the key is not found.
+
+## Exceptions
+
+* `EvaluationException` - If there was an error while evaluating one or more parameters.
+* `KeyException` - If the key is not found.
+* `TypeException` - If one or more parameters are not of the expected type.
+
+## Instruction Example
+
+```json
+{
+  "type": "array_get",
+  "_": {
+    "array": {
+      "foo": {
+        "bar": "baz"
+      }
+    },
+    "key": "foo.bar"
+  }
+}
+```
+
+### Last Updated
+
+Monday, December 26th, 2022.
+Written by [Netkas](https://git.n64.cc/netkas)