Fix example in LDM-2020-01-06.md (#3090)

meetings/2020/LDM-2020-01-06.md

@@ -17,7 +17,7 @@ Examples:
 1.
 
 ```C#
-bool TryGetValue<T>([MaybeNullWhen(true)]out T t)
+bool TryGetValue<T>([MaybeNullWhen(false)]out T t)
 {
     return other.TryGetValue(out t); // currently warns
 }
@@ -125,4 +125,4 @@ don't block a future generalization to all expressions. We need to find a genera
 like, reject a generalization and accept this syntax, or put these improvements on the
 back-burner if we think that a generalization is possible, we just haven't found it.
 
-Accepted for C# 9.0 investigation.
+Accepted for C# 9.0 investigation.