Updated yul.rst with feedback.

Updated yul.rst with explanation of 0x60 pointer choice.

docs/yul.rst

@@ -1162,7 +1162,8 @@ An example Yul Object is shown below:
         code {
             function allocate(size) -> ptr {
                 ptr := mload(0x40)
-                if iszero(ptr) { ptr := 0x80 }
+                // Note that Solidity generated IR code reserves memory offset ``0x60`` as well, but a pure Yul object is free to use memory as it chooses.
+                if iszero(ptr) { ptr := 0x60 }
                 mstore(0x40, add(ptr, size))
             }
 
@@ -1191,6 +1192,7 @@ An example Yul Object is shown below:
             code {
                 function allocate(size) -> ptr {
                     ptr := mload(0x40)
+                    // Note that Solidity generated IR code reserves memory offset ``0x60`` as well, but a pure Yul object is free to use memory as it chooses.
                     if iszero(ptr) { ptr := 0x60 }
                     mstore(0x40, add(ptr, size))
                 }