Adding links to EEPROM learn and fixing wrong links

Author: Hannes7eicher

content/hardware/02.hero/boards/due/features.md

@@ -34,8 +34,8 @@ The Due has 12 analog input pins, and 2 DAC pins.
 
 Use the Due as USB host for peripherals such as mice connected to the SerialUSB port.
 
-  <FeatureLink variant="primary" title="Documentation" url="/tutorials/mkr-iot-carrier-rev2/cheat-sheet#leds"/>
-  <FeatureLink variant="secondary" title="Library" url="https://www.arduino.cc/reference/en/libraries/arduino_mkriotcarrier/"/>
+  <FeatureLink variant="primary" title="Documentation" url="/tutorials/due/keyboard-controller"/>
+  <FeatureLink variant="secondary" title="Library" url="https://www.arduino.cc/reference/en/libraries/usbhost/"/>
 </Feature>
 
 <Feature title="Battery Connector" image="power">

content/hardware/02.hero/boards/leonardo/features.md

@@ -10,6 +10,8 @@ The Arduino Leonardo is a microcontroller board based on the ATmega32u4. It has
 
 The Arduino Leonardo has built-in USB communication that allows the Micro to appear as a mouse/keyboard on your machine.
 
+  <FeatureLink variant="secondary" title="Keyboard Library" url="https://www.arduino.cc/reference/en/language/functions/usb/keyboard/"/>
+  <FeatureLink variant="secondary" title="Mouse Library" url="https://www.arduino.cc/reference/en/language/functions/usb/mouse/"/>
 </Feature>
 
 <Feature title="Battery Connector" image="power">

content/hardware/02.hero/boards/mega-2560/features.md

@@ -11,6 +11,7 @@ The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has
 
 The ATmega2560 features 4kb (4096 bytes) of EEPROM, a memory which is not erased when powered off.
 
+  <FeatureLink variant="primary" title="Documentation" url="/learn/programming/eeprom-guide"/>
 </Feature>
 
 <Feature title="54 digital & 16 analog pins" image="hw-pin">

content/hardware/02.hero/boards/uno-rev3-smd/features.md

@@ -12,6 +12,7 @@ The "SMD" stands for surface-mount device, and the microcontroller (ATmega328p)
 
 The ATmega328P also features 1kb of EEPROM, a memory which is not erased when powered off.
 
+  <FeatureLink variant="primary" title="Documentation" url="/learn/programming/eeprom-guide"/>
 </Feature>
 
 <Feature title="Battery Connector" image="power">

content/hardware/02.hero/boards/uno-rev3/features.md

@@ -16,6 +16,7 @@ The ATmega328P can easily be replaced, as it is not soldered to the board.
 
 The ATmega328P also features 1kb of EEPROM, a memory which is not erased when powered off.
 
+  <FeatureLink variant="primary" title="Documentation" url="/learn/programming/eeprom-guide"/>
 </Feature>
 
 <Feature title="Battery Connector" image="power">

content/hardware/02.hero/boards/zero/features.md

@@ -15,10 +15,16 @@ The Zero comes with a built-in debugger, which can be used with the Arduino IDE
   <FeatureLink variant="primary" title="Documentation" url="/tutorials/zero/debugging-with-zero"/>
 </Feature>
 
-<Feature title="Battery Connector" image="power">
+<Feature title="Battery Connector" image="connection">
 
 The Arduino Zero features a barrel plug connector, that works great with a standard 9V battery.
 
+</Feature>
+
+<Feature title="Low Power Support" image="power">
+
+This board can be optimized to reduce power consumption via the Arduino Low Power library.
+
   <FeatureLink variant="secondary" title="Library" url="https://www.arduino.cc/reference/en/libraries/arduino-low-power/"/>
 </Feature>