Add note in about deprecation of CRM_Core_Error::fatal

docs/extensions/index.md

@@ -74,3 +74,11 @@ Fully supported methods are:
 * Internal Symfony listeners (e.g. `civi.api.resolve`, `civi.api.prepare`)
 
 See also this [blog post](https://civicrm.org/blog/totten/the-static-is-dead-long-live-the-static) describing the `Civi::` facade in more detail.
+
+### Deprecated Methods
+
+Some methods within the CiviCRM Code base that extension developers have been relying on have now been deprecated:
+
+ * `CRM_Core_Error::fatal`
+    Extension authors should replace fucntion calls with either `throw new CRM_Core_Exception` or `throw new <insert CiviCRM Generated Exception>` or `CRM_Core_Error::statusBounce` if the error is being generaged from a form.
+

docs/security/inputs.md

@@ -25,7 +25,7 @@ If you find yourself wanting to use the `'String'` type, beware that this type o
 ```php
 $angPage = CRM_Utils_Request::retrieve('angPage', 'String', $this);
 if (!preg_match(':^[a-zA-Z0-9\-_/]+$:', $angPage)) {
-  CRM_Core_Error::fatal('Malformed return URL');
+  throw new CRM_Core_Exception('Malformed return URL');
 }
 ```