Fix typos in comments (#10459)

mypy/build.py

@@ -2098,7 +2098,7 @@ def semantic_analysis_pass1(self) -> None:
         analyzer = SemanticAnalyzerPreAnalysis()
         with self.wrap_context():
             analyzer.visit_file(self.tree, self.xpath, self.id, options)
-        # TODO: Do this while contructing the AST?
+        # TODO: Do this while constructing the AST?
         self.tree.names = SymbolTable()
         if options.allow_redefinition:
             # Perform renaming across the AST to allow variable redefinitions

mypy/checker.py

@@ -2188,7 +2188,7 @@ def try_infer_partial_generic_type_from_assignment(self,
             if op != '=' and (typ.type.fullname, op) not in self.partial_type_augmented_ops:
                 return
             # TODO: some logic here duplicates the None partial type counterpart
-            #       inlined in check_assignment(), see # 8043.
+            #       inlined in check_assignment(), see #8043.
             partial_types = self.find_partial_types(var)
             if partial_types is None:
                 return
@@ -2905,7 +2905,7 @@ def infer_partial_type(self, name: Var, lvalue: Lvalue, init_type: Type) -> bool
         return True
 
     def is_valid_defaultdict_partial_value_type(self, t: ProperType) -> bool:
-        """Check if t can be used as the basis for a partial defaultddict value type.
+        """Check if t can be used as the basis for a partial defaultdict value type.
 
         Examples: