Minor improvements in documentation of macros

Cherry-picked from branch feature/resource-tight-alignment.
diff --git a/include/D3D12MemAlloc.h b/include/D3D12MemAlloc.h
index b2c76eb..5d46467 100644
--- a/include/D3D12MemAlloc.h
+++ b/include/D3D12MemAlloc.h
@@ -85,7 +85,7 @@
 

 #ifndef D3D12MA_DXGI_1_4

     #ifdef __IDXGIAdapter3_INTERFACE_DEFINED__

-        /// Define this macro to 0 to disable usage of DXGI 1.4 (which is used for IDXGIAdapter3 and query for memory budget).

+        /// Define this macro to 0 to disable usage of DXGI 1.4 (which is used for `IDXGIAdapter3` and query for memory budget).

         #define D3D12MA_DXGI_1_4 1

     #else

         #define D3D12MA_DXGI_1_4 0

@@ -94,6 +94,7 @@
 

 #ifndef D3D12MA_CREATE_NOT_ZEROED_AVAILABLE

     #ifdef __ID3D12Device8_INTERFACE_DEFINED__

+        /// This macro is defined to 0 or 1 automatically. Define it to 0 to disable support for `D3D12_HEAP_FLAG_CREATE_NOT_ZEROED`.

         #define D3D12MA_CREATE_NOT_ZEROED_AVAILABLE 1

     #else

         #define D3D12MA_CREATE_NOT_ZEROED_AVAILABLE 0

@@ -128,9 +129,9 @@
 

 #ifndef D3D12MA_RECOMMENDED_HEAP_FLAGS

     #if D3D12MA_CREATE_NOT_ZEROED_AVAILABLE

-        /// Set of flags recommended for use in D3D12MA::POOL_DESC::HeapFlags for optimal performance.

         #define D3D12MA_RECOMMENDED_HEAP_FLAGS (D3D12_HEAP_FLAG_CREATE_NOT_ZEROED)

     #else

+        /// Set of flags recommended for use in D3D12MA::POOL_DESC::HeapFlags for optimal performance.

         #define D3D12MA_RECOMMENDED_HEAP_FLAGS (D3D12_HEAP_FLAG_NONE)

     #endif

 #endif