Merge #12800: doc: Add note about our preference for scoped enumerations ("enum class")

0fee2b4 doc: Add note about our preference for scoped enumerations ("enum class") (practicalswift)

Pull request description:

  Add note about our preference for scoped enumerations (`enum class`).

  Context: #10742

Tree-SHA512: 0ab3465c2b734240cb38a05c2f6e75f1af54207a0f1a2e8115e7b367fd37e8966a2fc0240c6d4c2c66b6677b5f367eda4f4b783bbaa419777336c17f04adff06

doc/developer-notes.md

@@ -39,6 +39,7 @@ code.
   - `++i` is preferred over `i++`.
   - `nullptr` is preferred over `NULL` or `(void*)0`.
   - `static_assert` is preferred over `assert` where possible. Generally; compile-time checking is preferred over run-time checking.
+  - `enum class` is preferred over `enum` where possible. Scoped enumerations avoid two potential pitfalls/problems with traditional C++ enumerations: implicit conversions to int, and name clashes due to enumerators being exported to the surrounding scope.
 
 Block style example:
 ```c++