Fix typos in installer welcome message

install/hst-install-debian.sh

@@ -1753,7 +1753,7 @@ Web:     https://www.hestiacp.com/
 Forum:   https://forum.hestiacp.com/
 GitHub:  https://www.github.com/hestiacp/hestiacp
 
-Want to join the our beta test program? Please email us at
+Want to join our beta test program? Please email us at
 info@hestiacp.com or join in on GitHub to start contributing today.
 
 Help support the Hestia Contol Panel project by donating via PayPal:

install/hst-install-ubuntu.sh

@@ -1668,7 +1668,7 @@ Web:     https://www.hestiacp.com/
 Forum:   https://forum.hestiacp.com/
 GitHub:  https://www.github.com/hestiacp/hestiacp
 
-Want to join the our beta test program? Please email us at
+Want to join our beta test program? Please email us at
 info@hestiacp.com or join in on GitHub to start contributing today.
 
 Help support the Hestia Contol Panel project by donating via PayPal:

install/upgrade/0.9.8-28.sh

@@ -170,7 +170,7 @@ elif [ "$WEB_BACKEND" = "apache2" ]; then
         done
     fi
 elif [ "$PROXY_SYSTEM" = "nginx" ]; then
-    echo "(*) Adding unassigned hosts configuration to nginx.."
+    echo "(*) Adding unassigned hosts configuration to nginx..."
     if [ -f /usr/local/hestia/data/ips/* ]; then
         for ip in /usr/local/hestia/data/ips/*; do
             ipaddr=${ip##*/}