Update finding-memory-leaks-using-the-crt-library.md

Added reminder to load symbols https://stackoverflow.com/questions/30357986/using-crtbreakalloc-to-find-memory-leaks-identifier-crtbreakalloc-is-unide

Author: definedrisk

docs/debugger/finding-memory-leaks-using-the-crt-library.md

@@ -184,6 +184,8 @@ You can use the allocation number to set a breakpoint on the memory allocation.
 1. In the **Watch** window, type `_crtBreakAlloc` in the **Name** column.
 
    If you're using the multithreaded DLL version of the CRT library (the /MD option), add the context operator: `{,,ucrtbased.dll}_crtBreakAlloc`
+   
+   Make sure that debug symbols are loaded otherwise `_crtBreakAlloc` will be reported as *unidentified*.
 
 1. Press **Enter**.