fix: POSIX cron redirect and Spine capitalization

Replace bash-ism `&>/dev/null` with POSIX-compatible `>/dev/null 2>&1`
in cron job example. Capitalize Spine consistently in Spine.md testing
section.

Signed-off-by: Thomas Vincent <thomasvincent@gmail.com>

Author: somethingwithproof

Installing-Under-Ubuntu-Debian.md

@@ -120,7 +120,7 @@ Create and edit `/etc/cron.d/cacti` file.
 Make sure to setup the correct path to poller.php
 
 ```console
-*/5 * * * * www-data php /var/www/html/cacti/poller.php &>/dev/null
+*/5 * * * * www-data php /var/www/html/cacti/poller.php >/dev/null 2>&1
 ```
 
 For systemd unit's file install, you will need to modify the

Spine.md

@@ -135,9 +135,9 @@ chmod u+s /usr/local/spine/bin/spine
 
 ### Testing/Debugging spine via command line
 
-spine offers a few different ways at the command line to test its
+Spine offers a few different ways at the command line to test its
 functionality. Here are a few examples of some tests you can run by executing
-spine.
+Spine.
 
 #### Test Spine without writing results to database