Move README information into test desc files

Author: TGWDB

regression/cbmc/dereference-cache-flag/README.md

@@ -6,9 +6,9 @@ test.c
 ^SIGNAL=0$
 --
 --
-Note that dereference caching is turned ON by default
-in tests just to make sure that it doesn't break
-anything.
+This is just checking that the --symex-cache-dereferences flag actually turns
+dereference caching on and off. Note that dereference caching is turned ON
+by default in tests just to make sure that it doesn't break anything.
 
 I would like to match the expression more precisely, but the order of
 comparisons for address of depends on platform-specific logic (unordered_xxx),

regression/cbmc/dereference-cache-flag/test-no-cache.desc

@@ -6,5 +6,6 @@ symex::dereference_cache!0#1 = 0
 ^SIGNAL=0$
 --
 --
-Note that dereference caching is turned ON by default in
-tests just to make sure that it doesn't break anything.
+This is just checking that the --symex-cache-dereferences flag actually
+turns dereference caching on Note that dereference caching is turned ON
+by default in tests just to make sure that it doesn't break anything.