Updated Build Troubleshooting (markdown)

Build-Troubleshooting.md

@@ -2,6 +2,12 @@
 
 # Core MicroPython
 
+## `STATIC` 
+
+To fix this, replace all usages of `STATIC` with `static` in your code (likely a User C Module).
+
+See https://github.com/micropython/micropython/pull/13763 for details.
+
 ## `mp_generic_unary_op` missing
 
 This function was removed in v1.21. If you have a module that defined a type that used it, then likely all you need to do is remove the `unary_op` slot from your type.