Add change note.

Author: lcartey

change_notes/2024-10-20-8-13-fixes.md

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+ - `RULE-8-13` - `PointerShouldPointToConstTypeWhenPossible.ql`
+   - Exclude false positives where a variable occurs in a file compiled multiple times, but where it may only be const in some of those scenarios.
+   - Exclude results for local scope variables in functions that use assembly code, as CodeQL cannot determine the impact of the assembly.
+   - Exclude false positives when an assignment is made to a struct field.
+   - Exclude false positives where the object pointed to by the variable is modified using `*p++ = ...`.