resources: Cleaned SPEC 2006 and 2017 README

This commit expands the SPEC 2006 description to something more detailed
and fixes some incorrect directory references.

Change-Id: Ia477f7d094af781bb724a19ff4832d12e9dd3dfc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-resources/+/32537
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Jason Lowe-Power <power.jg@gmail.com>
diff --git a/README.md b/README.md
index 0b9b29f..1ef48a9 100755
--- a/README.md
+++ b/README.md
@@ -347,12 +347,22 @@
 
 <http://dist.gem5.org/dist/v20/test-progs/square/square.o>
 
-# Resource: SPEC-2006 tests
+# Resource: SPEC 2006
 
-Contains scripts to create a disk image and to run SPEC-2006 tests on gem5.
-Instructions on how to use these scripts can be found here `src/spec2006-tests/README.md`.
+The [Standard Performance Evaluation Corporation](
+https://www.spec.org/benchmarks.html) (SPEC) CPU 2006 benchmarks are designed
+to provide performance measurements that can be used to compare
+compute-intensive workloads on different computer systems. SPEC CPU 2006
+contains 12 different benchmark tests.
 
-# Resource: SPEC 2017 tests
+`src/spec-2006` provides resources on creating a SPEC 2006 disk image, and
+necessary scripts to run the SPEC 2006 benchmarks within X86 gem5 simulations.
+Please consult the `src/spec-2006/README.md` for more information.
+
+**Please note, due to licensing issues, the SPEC 2006 iso cannot be provided
+as part of this repository.**
+
+# Resource: SPEC 2017
 
 The [Standard Performance Evaluation Corporation](
 https://www.spec.org/benchmarks.html) (SPEC) CPU 2017 benchmarks are designed
@@ -432,12 +442,12 @@
 `src/pthreads`.
 * **square**: Consult individual copyright notices of source files in
 `src/square`.
-* **spec2006-tests**: SPEC CPU 2006 requires purchase of benchmark suite from
+* **spec 2006**: SPEC CPU 2006 requires purchase of benchmark suite from
 [SPEC](https://www.spec.org/cpu2006/) thus, it cannot be freely distributed.
-Consult individual copyright notices of source files in `src/spec2006-tests`.
-* **spec-2017**: SPEC CPU 2017 requires purchase of benchmark suite from
+Consult individual copyright notices of source files in `src/spec-2006`.
+* **spec 2017**: SPEC CPU 2017 requires purchase of benchmark suite from
 [SPEC](https://www.spec.org/cpu2017/) thus, it cannot be freely distributed.
-Consult individual copyright notices of source files in `src/spec2017-tests`.
+Consult individual copyright notices of source files in `src/spec-2017`.
 * **gapbs**: Consult individual copyright notices of source files in
 `src/gapbs`.
 * **parsec**: The PARSEC license can be found at