Expand error example for missing required architecture

I was searching on the linker error and failed to get any hits. Best to
include the complete error, so search on any part of it is more likely
to get you the right result.

Author: brunobowden

FAQ.md

@@ -456,12 +456,18 @@ If you see a message similar to:
 ld: warning: ignoring file /PATH/j2objcOutputs/lib/iosDebug/libPROJECT-j2objc.a,
 missing required architecture i386 in file /PATH/j2objcOutputs/lib/iosDebug/libPROJECT-j2objc.a
 (3 slices)
+
+
+Undefined symbols for architecture i386:
+  "_OBJC_CLASS_$_ComExampleShared", referenced from:
+      type metadata accessor for ObjectiveC.ComExampleShared in ViewController.o
+ld: symbol(s) not found for architecture i386
 ```
-and additionally get linker errors, you are not building all the neccessary architectures.
+You are not building all the neccessary architectures.
 
-By default (for performance), we build only modern iOS device and simulator architectures.
-If you need i386 for older simulators (iPhone 5, 5c and earlier devices), add the following
-to your build.gradle file:
+By default (for performance), we build only modern iOS device and simulator
+architectures. If you need i386 for older simulators (iPhone 5, 5c and earlier
+devices), add the following to your build.gradle file:
 
 ```gradle
 // File: build.gradle