Fixed export/import from/to amf and 3mf file.

src/imgui/imconfig.h

@@ -107,7 +107,7 @@ namespace ImGui
     const char ColorMarkerStart = 0x2; // STX
     const char ColorMarkerEnd   = 0x3; // ETX
 
-    // Special ASCII characters are used here as a ikons markers 
+    // Special ASCII characters are used here as an ikons markers 
     const char PrintIconMarker      = 0x4; 
     const char PrinterIconMarker    = 0x5; 
     const char PrinterSlaIconMarker = 0x6;