misc: Updated the RELEASE-NOTES and version number

Updated the RELEASE-NOTES.md and version number for the v20.1.0.3
hotfix release.

Change-Id: I95ab84ea259f5e0529ebaa32be65d9a14370f219
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40435
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

RELEASE-NOTES.md

@@ -1,3 +1,8 @@
+# Version 20.1.0.3
+
+**[HOTFIX]** A patch was apply to fix an [error where booting Linux stalled when using the ARM ISA](https://gem5.atlassian.net/browse/GEM5-901).
+This fix adds the parameter `have_vhe` to enable FEAT_VHE on demand, and is disabled by default to resolve this issue.
+
 # Version 20.1.0.2
 
 **[HOTFIX]** This hotfix release fixes known two bugs:

src/Doxyfile

@@ -31,7 +31,7 @@ PROJECT_NAME           = gem5
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = v20.1.0.2
+PROJECT_NUMBER         = v20.1.0.3
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 

src/base/version.cc

@@ -29,4 +29,4 @@
 /**
  * @ingroup api_base_utils
  */
-const char *gem5Version = "20.1.0.2";
+const char *gem5Version = "20.1.0.3";