Add notice for signing issues when exporting to iOS with same name (#3810)

getting_started/workflow/export/exporting_for_ios.rst

@@ -63,6 +63,9 @@ In the following example:
   * **exported_xcode_project_name** is the name of the exported iOS application (as above).
   * **godot_project_to_export** is the name of the Godot project.
 
+.. note:: **godot_project_to_export** must not be the same as **exported_xcode_project_name**
+          to prevent signing issues in Xcode.
+
 Steps to link a Godot project folder to Xcode
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~