message: doc: tweak page
diff: @@ -18,10 +18,10 @@ Heap used for allocating program memory lives.
  DEFINITIONS
  -----------
  -- **Page**: The smallest block of memory managed by the operating system,
  - 4Kb on Linux. Memory given to the allocator by the operating system
  - is always in multiples of the page size, and aligned to the page
  - size.
  +- **Page**: The smallest block of memory managed by the operating
  + system, 4Kb on most architectures. Memory given to the allocator by
  + the operating system is always in multiples of the page size, and
  + aligned to the page size.
  - **Span**: The size of memory managed by Mesh -- [currently 128
  Kb](src/include/miniheap.h#L36).
  It is larger than the page size to amortize the cost of heap
  