In description correct 'package' to plural form, remove redundancy, and improve clarity

meta-core/meta-core.spec

@@ -76,10 +76,10 @@ AutoReqProv:  no
         gzip, libtool, m4, make, ntp, openpkg, openssh, openssl, patch,
         perl, rsync, screen, shtool, tar, vim, zlib.
 
-    Installing this and its referenced package allows you to make sure
-    that all CORE class packages can be built on a particular platform.
-    Additionally, the CORE class packages provide a reasonable set of
-    base packages mostly all machines should have installed.
+    Installing this and its referenced packages ensures that all CORE
+    class packages can be built on a particular platform. Additionally,
+    the CORE class packages amount to a reasonable package set which
+    most machines should have.
 
 %prep