Remove defunct TODO from spec

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

vm.md

@@ -225,16 +225,6 @@ wrapping around to 0.
 * Dump
     * Opcode: 0xF002
 
-## Other instructions TODO
-
-* Call
-    * Takes address and number of bytes on the stack that are for args(?)
-    * Updates SP, FP, IP, storing previous values starting at the new FP
-* Ret
-    * Uses FP to determine previous SP, FP, and IP and restores them
-* Push
-* Pop
-
 # Binary object format
 
 The binary object format is composed of a header followed by sections that make up the content of