Fix typos in comments across Venom analysis and codegen

vyper/venom/analysis/available_expression.py

@@ -262,7 +262,7 @@ def analyze(self):
             if self._handle_bb(bb):
                 worklist.extend(self.cfg.cfg_out(bb))
 
-    # msize effect should be only necessery
+    # msize effect should be only necessary
     # to be handled when there is a possibility
     # of msize read otherwise it should not make difference
     # for this analysis
@@ -317,7 +317,7 @@ def _handle_bb(self, bb: IRBasicBlock) -> bool:
 
         if bb not in self.bb_outs or available_exprs != self.bb_outs[bb]:
             self.bb_outs[bb] = available_exprs
-            # change is only necessery when the output of the
+            # change is only necessary when the output of the
             # basic block is changed (otherwise it wont affect rest)
             change |= True
 

vyper/venom/passes/algebraic_optimization.py

@@ -60,7 +60,7 @@ def _optimize_iszero_chains(self) -> None:
                     opcode = use_inst.opcode
 
                     if opcode == "iszero":
-                        # We keep iszero instuctions as is
+                        # We keep iszero instructions as is
                         continue
                     if opcode in ("jnz", "assert"):
                         # instructions that accept a truthy value as input:

vyper/venom/venom_to_assembly.py

@@ -400,7 +400,7 @@ def _generate_evm_for_instruction(
             operands = [offset]
 
         # iload and istore are special cases because they can take a literal
-        # that is handled specialy with the _OFST macro. Look below, after the
+        # that is handled specially with the _OFST macro. Look below, after the
         # stack reordering.
         elif opcode == "iload":
             addr = inst.operands[0]