Add "miscellaneous" instructions section, move Halt to there, add Nop

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

vm.md

@@ -129,10 +129,6 @@ wrapping around to 0.
         }
     ```
     * Jumps to the address in REG1 if COMPARE flag is 1.
-* Halt
-    * **Params**: (none)
-    * `FLAGS[0] = 1`
-    * Halts the machine
 
 ## Data movement
 
@@ -161,6 +157,16 @@ wrapping around to 0.
     * `REG1 = REG2`
     * Copies the value in REG2 into REG1.
 
+## Miscellaneous
+
+* Halt
+    * **Params**: (none)
+    * `FLAGS[0] = 1`
+    * Halts the machine
+* Nop
+    * **Params**: (none)
+    * Does nothing
+
 ## Other instructions TODO
 
 * Call