README.md hard-wrapped at 80 chars

From [review feedback from
Laurie](capablevms#88 (comment)); thanks!

example_allocators/compartment_alloc/README.md

@@ -1,17 +1,17 @@
 # Compartmentalising Allocator
 
-A modification of the "bump allocator" in this repo.
-This allocator creates compartments on the heap, and returns capabilities
-to allocations within the compartment.
+A modification of the "bump allocator" in this repo. This allocator creates
+compartments on the heap, and returns capabilities to allocations within the
+compartment.
 
 Because allocations are made against a compartment's (previously `mmap`'d)
 buffer, we need to identify the compartment being used when we call `malloc`.
-`init_compartment` returns a capability used to identify the compartment it 
+`init_compartment` returns a capability used to identify the compartment it
 creates; calls to `malloc_compartment` accept this identifier as a parameter.
 
 `main.c` shows a simple use, with allocations against two different
 compartments.
 
-Example is run using `make` in the typical fashion for the repo
-(i.e. along the lines of `make -f Makefile.morello-hybrid run-main`).
+Example is run using `make` in the typical fashion for the repo (i.e. along the
+lines of `make -f Makefile.morello-hybrid run-main`).