test: lake: tests/manifest -> tests/depTree

also clarify its difference  distinction with `tests/clone`

src/lake/tests/clone/test.sh

@@ -11,6 +11,8 @@ fi
 
 ./clean.sh
 
+# Test Lake's management of a single Git-cloned dependency.
+
 mkdir hello
 pushd hello
 $LAKE init hello

src/lake/tests/depTree/test.sh

@@ -11,7 +11,8 @@ fi
 
 ./clean.sh
 
-# tests issues:
+# Test the functionality of Lake's dependency resolution
+# in many edge cases with a full tree of dependencies.
 # https://github.com/leanprover/lake/issues/70
 # https://github.com/leanprover/lake/issues/84
 # https://github.com/leanprover/lake/issues/85