uefi: mem: doc fixes

Author: phip1611

uefi/src/mem/memory_map/impl_.rs

@@ -248,8 +248,9 @@ impl MemoryMapBackingMemory {
     }
 
     /// Returns a "safe" best-effort size hint for the memory map size with
-    /// some additional bytes in buffer compared to the [`crate::table::boot::mmap::MemoryMapMeta`].
-    /// This helps
+    /// some additional bytes in buffer compared to the [`MemoryMapMeta`]. This
+    /// takes into account that, as you go, more (small) allocations might 
+    /// happen.
     #[must_use]
     fn safe_allocation_size_hint(mmm: MemoryMapMeta) -> usize {
         // Allocate space for extra entries beyond the current size of the