remove redundant Documentation tag

hardware/brightness.md

@@ -1,6 +1,6 @@
 ---
 title: "brightness"
-tags: [ "Documentation", "hardware" ]
+tags: [ "hardware" ]
 ---
 # Brightness
 

hardware/keyboard.md

@@ -1,6 +1,6 @@
 ---
 title: "keyboard"
-tags: [ "Documentation", "keyboard", "vim" ]
+tags: [ "keyboard", "vim" ]
 ---
 
 # System-Wide Capslock and Escape Swap

hardware/monitor.md

@@ -1,6 +1,6 @@
 ---
 title: "monitor"
-tags: [ "Documentation", "hardware" ]
+tags: [ "hardware" ]
 ---
 See screen size
 

hardware/printers.md

@@ -1,6 +1,6 @@
 ---
 title: "printers"
-tags: [ "Documentation", "hardware" ]
+tags: [ "hardware" ]
 ---
 # Cups: The Common Unix Printing System