rename spec files to be more consistent in naming

PACKAGING

@@ -4,19 +4,19 @@ This file describes the procedures how to package the fast-vm and related packag
 # yum install rpmdevtools bash-completion
 # rpmdev-setuptree
 # curl https://codeload.github.com/OndrejHome/fast-vm/tar.gz/1.5 > rpmbuild/SOURCES/1.5.tar.gz
-# curl https://raw.githubusercontent.com/OndrejHome/fast-vm/master/rpm/fast-vm-centos7.spec > rpmbuild/SPECS/fast-vm.spec
+# curl https://raw.githubusercontent.com/OndrejHome/fast-vm/master/rpm/fast-vm-el7.spec > rpmbuild/SPECS/fast-vm.spec
 # rpmbuild -ba rpmbuild/SPECS/fast-vm.spec
 
 resulting files
 - rpmbuild/SRPMS/fast-vm-1.5-1.el7.centos.src.rpm
 - rpmbuild/RPMS/noarch/fast-vm-1.5-1.el7.centos.noarch.rpm
 - rpmbuild/RPMS/noarch/fast-vm-minimal-1.5-1.el7.centos.noarch.rpm
 
-=== fast-vm RPM for RHEL 8
+=== fast-vm RPM for CentOS/RHEL 8
 # dnf install rpmdevtools bash-completion make
 # rpmdev-setuptree
 # curl https://codeload.github.com/OndrejHome/fast-vm/tar.gz/1.5 > rpmbuild/SOURCES/1.5.tar.gz
-# curl https://raw.githubusercontent.com/OndrejHome/fast-vm/develop/rpm/fast-vm-rhel8.spec > rpmbuild/SPECS/fast-vm.spec
+# curl https://raw.githubusercontent.com/OndrejHome/fast-vm/develop/rpm/fast-vm-el8.spec > rpmbuild/SPECS/fast-vm.spec
 # rpmbuild -ba rpmbuild/SPECS/fast-vm.spec
 
 resulting files
@@ -28,7 +28,7 @@ resulting files
 # dnf install rpmdevtools bash-completion make
 # rpmdev-setuptree
 # curl https://codeload.github.com/OndrejHome/fast-vm/tar.gz/1.5 > rpmbuild/SOURCES/1.5.tar.gz
-# curl https://raw.githubusercontent.com/OndrejHome/fast-vm/master/rpm/fast-vm.spec > rpmbuild/SPECS/fast-vm.spec
+# curl https://raw.githubusercontent.com/OndrejHome/fast-vm/master/rpm/fast-vm-fedora.spec > rpmbuild/SPECS/fast-vm.spec
 # rpmbuild -ba rpmbuild/SPECS/fast-vm.spec
 
 resulting files