chore(Any): Apply suggestions from code review.

Foundation/include/Poco/Any.h

@@ -83,7 +83,7 @@ union Placeholder
 		// Forces to use optimised memset internally
 		// https://travisdowns.github.io/blog/2020/01/20/zero.html
 		std::fill(std::begin(holder), std::end(holder), static_cast<char>(0));
-		setAllocation(Allocation::EMPTY);
+		setAllocation(Allocation::POCO_ANY_EMPTY);
 	}
 
 	~Placeholder()
@@ -104,12 +104,12 @@ union Placeholder
 
 	bool isEmpty() const
 	{
-		return holder[SizeV] == Allocation::EMPTY;
+		return holder[SizeV] == Allocation::POCO_ANY_EMPTY;
 	}
 
 	bool isLocal() const
 	{
-		return holder[SizeV] == Allocation::LOCAL;
+		return holder[SizeV] == Allocation::POCO_ANY_LOCAL;
 	}
 
 	template<typename T, typename V,
@@ -118,7 +118,7 @@ union Placeholder
 	{
 		erase();
 		new (reinterpret_cast<PlaceholderT*>(holder)) T(value);
-		setAllocation(Allocation::LOCAL);
+		setAllocation(Allocation::POCO_ANY_LOCAL);
 		return reinterpret_cast<PlaceholderT*>(holder);
 	}
 
@@ -128,7 +128,7 @@ union Placeholder
 	{
 		erase();
 		pHolder = new T(value);
-		setAllocation(Allocation::EXTERNAL);
+		setAllocation(Allocation::POCO_ANY_EXTERNAL);
 		return pHolder;
 	}
 
@@ -144,10 +144,11 @@ union Placeholder
 	using AlignerType = std::max_align_t;
 	static_assert(sizeof(AlignerType) <= SizeV + 1, "Aligner type is bigger than the actual storage, so SizeV should be made bigger otherwise you simply waste unused memory.");
 
-	enum Allocation : unsigned char {
-		EMPTY = 0,
-		LOCAL = 1,
-		EXTERNAL = 2
+	enum Allocation : unsigned char
+	{
+		POCO_ANY_EMPTY = 0,
+		POCO_ANY_LOCAL = 1,
+		POCO_ANY_EXTERNAL = 2
 	};
 
 	void setAllocation(Allocation state) const
@@ -159,15 +160,15 @@ union Placeholder
 	{
 		switch (holder[SizeV])
 		{
-		case Allocation::EMPTY:
+		case Allocation::POCO_ANY_EMPTY:
 			break;
-		case Allocation::LOCAL:
+		case Allocation::POCO_ANY_LOCAL:
 			{
 				auto* h { reinterpret_cast<PlaceholderT*>(holder) };
 				h->~PlaceholderT();
 			}
 			break;
-		case Allocation::EXTERNAL:
+		case Allocation::POCO_ANY_EXTERNAL:
 			{
 				auto* h { pHolder };
 				pHolder = nullptr;
@@ -183,7 +184,7 @@ union Placeholder
 			// Force to use optimised memset internally
 			std::fill(std::begin(holder), std::end(holder), static_cast<char>(0));
 		}
-		setAllocation(Allocation::EMPTY);
+		setAllocation(Allocation::POCO_ANY_EMPTY);
 	}
 
 	mutable unsigned char holder[SizeV+1];
@@ -279,8 +280,11 @@ class Any
 	}
 
 	~Any() = default;
-		/// Destructor. If Any is locally held, calls ValueHolder destructor;
-		/// otherwise, deletes the placeholder from the heap.
+		/// Destructor.
+		/// Small Object Optimization mode behavior:
+		/// Invokes the Placeholder destructor, which calls the
+		/// ValueHolder destructor explicitly (locally held Any), or
+		/// deletes the ValueHolder heap memory (heap-allocated Any).
 
 	Any& swap(Any& other) noexcept
 		/// Swaps the content of the two Anys.