README.md clean-up

Add a little more description for what belongs in meta-arm/meta-arm (per
feedback from Richard Purdie), and modify the max width to be 80
characters to improve readability.

Change-Id: I8f7b0598e3336132c2594c92cf3400dd5e216baf
Signed-off-by: Jon Mason <jon.mason@arm.com>

README.md

@@ -3,7 +3,9 @@ Introduction
 This repository contains Arm layers for OpenEmbedded
 
 meta-arm:
-	This layer provides support for general recipes for the Arm architecture
+	This layer provides support for general recipes for the Arm
+	architecture.  Anything that's not needed explicitly for BSPs, the IOTA
+	distribution, or destined to be upstreamed belongs here.
 
 meta-arm-bsp:
 	This layer provides support for Arm reference platforms
@@ -12,19 +14,22 @@ meta-arm-iota:
 	This layer provides support for Arm's IOTA Linux Distribution
 
 meta-arm-integration:
-	This layer provides support for OpenEmbedded and Yocto patches that have yet to be accepted upstream
+	This layer provides support for OpenEmbedded and Yocto patches that have
+	yet to be accepted upstream
 
 
 Contributing
 ------------
-Currently, we only accept patches from the meta-arm mailing list.  For general information on how to submit a patch, please read
+Currently, we only accept patches from the meta-arm mailing list.  For general
+information on how to submit a patch, please read
 https://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded
 
 E-mail meta-arm@lists.yoctoproject.org with patches created using this process
 
 Reporting bugs
 --------------
-E-mail meta-arm@lists.yoctoproject.org with the error encountered and the steps to reproduce the issue
+E-mail meta-arm@lists.yoctoproject.org with the error encountered and the steps
+to reproduce the issue
 
 
 Maintainer(s)