docs: add WD My Net N600/N750 to list of supported devices

docs/index.rst

@@ -150,6 +150,11 @@ ar71xx-generic
   - UniFi AP Pro
   - UniFi AP Outdoor
 
+* Western Digital
+
+  - My Net N600
+  - My Net N750
+
 ar71xx-nand
 ^^^^^^^^^^^
 

docs/releases/v2015.2.rst

@@ -22,6 +22,11 @@ ar71xx-generic
   - TL-WR941ND v6
   - TL-WR1043N/ND v3
 
+* Western Digital
+
+  - My Net N600
+  - My Net N750
+
 x86-xen_domu
 ^^^^^^^^^^^^