Update comments

PowerTools repository is worked if use lower-case

wireguard.sh

@@ -293,7 +293,7 @@ install_wg_pkgs() {
             _error_detect "yum -y install gcc"
             _error_detect "yum -y install make"
             _error_detect "yum -y install yum-utils"
-            [ -n "$(_os_ver)" -a "$(_os_ver)" -eq 8 ] && _error_detect "yum-config-manager --enable PowerTools"
+            [ -n "$(_os_ver)" -a "$(_os_ver)" -eq 8 ] && _error_detect "yum config-manager --set-enabled powertools"
             _error_detect "yum -y install libmnl-devel"
             _error_detect "yum -y install elfutils-libelf-devel"
             [ ! -d "/usr/src/kernels/$(uname -r)" ] && _error_detect "yum -y install kernel-headers" && _error_detect "yum -y install kernel-devel"