Added minor changes

doc/Installation/Install-LibreNMS.md

@@ -19,28 +19,28 @@ you select the same option when they are presented.
         apt install software-properties-common
         add-apt-repository universe
         apt update
-        apt install acl curl composer fping git graphviz imagemagick mariadb-client mariadb-server mtr-tiny nginx-full nmap php7.4-cli php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mbstring php7.4-mysql php7.4-snmp php7.4-xml php7.4-zip rrdtool snmp snmpd whois unzip python3-pymysql python3-dotenv python3-redis python3-setuptools
+        apt install acl curl composer fping git graphviz imagemagick mariadb-client mariadb-server mtr-tiny nginx-full nmap php7.4-cli php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mbstring php7.4-mysql php7.4-snmp php7.4-xml php7.4-zip rrdtool snmp snmpd whois unzip python3-pymysql python3-dotenv python3-redis python3-setuptools python3-pip
         ```
 
     === "Apache"
         ```
         apt install software-properties-common
         add-apt-repository universe
         apt update
-        apt install acl curl apache2 composer fping git graphviz imagemagick libapache2-mod-fcgid mariadb-client mariadb-server mtr-tiny nmap php7.4-cli php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mbstring php7.4-mysql php7.4-snmp php7.4-xml php7.4-zip rrdtool snmp snmpd whois python3-pymysql python3-dotenv python3-redis python3-setuptools
+        apt install acl curl apache2 composer fping git graphviz imagemagick libapache2-mod-fcgid mariadb-client mariadb-server mtr-tiny nmap php7.4-cli php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mbstring php7.4-mysql php7.4-snmp php7.4-xml php7.4-zip rrdtool snmp snmpd whois python3-pymysql python3-dotenv python3-redis python3-setuptools python3-pip
         ```
 
 === "CentOS 8"
     === "NGINX"
         ```
         dnf install epel-release
-        dnf install bash-completion cronie fping git ImageMagick mariadb-server mtr net-snmp net-snmp-utils nginx nmap php-fpm php-cli php-common php-curl php-gd php-json php-mbstring php-process php-snmp php-xml php-zip php-mysqlnd python3 python3-PyMySQL python3-redis python3-memcached rrdtool
+        dnf install bash-completion cronie fping git nginx ImageMagick mariadb-server mtr net-snmp net-snmp-utils nmap php-fpm php-cli php-common php-curl php-gd php-json php-mbstring php-process php-snmp php-xml php-zip php-mysqlnd python3 python3-PyMySQL python3-redis python3-memcached python3-pip rrdtool
         ```
 
     === "Apache"
         ```
         dnf install epel-release
-        dnf install bash-completion cronie fping git httpd ImageMagick mariadb-server mtr net-snmp net-snmp-utils nmap php-fpm php-cli php-common php-curl php-gd php-json php-mbstring php-process php-snmp php-xml php-zip php-mysqlnd python3 python3-PyMySQL python3-redis python3-memcached rrdtool unzip
+        dnf install bash-completion cronie fping git httpd ImageMagick mariadb-server mtr net-snmp net-snmp-utils nmap php-fpm php-cli php-common php-curl php-gd php-json php-mbstring php-process php-snmp php-xml php-zip php-mysqlnd python3 python3-PyMySQL python3-redis python3-memcached python3-pip rrdtool unzip
         ```
 
 === "Debian 10"
@@ -394,11 +394,6 @@ listen = /run/php-fpm-librenms.sock;
     SELinux not enabled by default
 
 === "CentOS 8"
-    Install the policy tool for SELinux:
-
-    ```
-    dnf install policycoreutils-python-utils
-    ```
 
     ## Configure the contexts needed by LibreNMS:
 
@@ -457,7 +452,10 @@ listen = /run/php-fpm-librenms.sock;
     firewall-cmd --permanent --zone public --add-service http --add-service https
     ```
 
-# Enable lnms command completion
+# Enable lnms command auto-completion
+
+This feature grants you the opportunity to use tab for completion on lnms commands as you would
+for normal linux commands.
 
 ```
 ln -s /opt/librenms/lnms /usr/local/bin/lnms
@@ -523,6 +521,24 @@ to the file. Run:
 chown librenms:librenms /opt/librenms/config.php
 ```
 
+# Set location to fping6
+
+On the validate screen, <http://librenms.example.com/validate> 
+you might get a message like this:
+
+```
+fping6 location is incorrect or bin not installed.
+```
+
+=== "Ubuntu 20.04 / Debian 10"
+    This is not a known problem in this distro.
+=== "CentOS 8"
+    To fix this: copy the following line to `config.php`:
+
+    ```
+    $config['fping6'] = '/usr/sbin/fping';
+    ```
+
 # Final steps
 
 That's it!  You now should be able to log in to